BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Space Calendar - ECPv6.17.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://spacecalendar.com
X-WR-CALDESC:Events for Space Calendar
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Pacific/Honolulu
BEGIN:STANDARD
TZOFFSETFROM:-1000
TZOFFSETTO:-1000
TZNAME:HST
DTSTART:20250101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260725
DTEND;VALUE=DATE:20260726
DTSTAMP:20260718T004948Z
CREATED:20260718T004418Z
LAST-MODIFIED:20260718T004948Z
UID:10001396-1784937600-1785023999@spacecalendar.com
SUMMARY:ISS Change of Command - Jessica Meir Becomes Exp 75 Commander
DESCRIPTION:NASA astronaut Jessica Meir takes command of ISS during changeover\, followed by three Expedition 74 crew members returning to Earth.
URL:https://spacecalendar.com/event/iss-change-of-command-jessica-meir-becomes-exp-75-commander/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Mission Milestone
ATTACH;FMTTYPE=image/jpeg:https://spacecalendar.com/wp-content/uploads/2026/07/Jessica-Meir.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260726
DTEND;VALUE=DATE:20260727
DTSTAMP:20260708T033318Z
CREATED:20260708T033200Z
LAST-MODIFIED:20260708T033318Z
UID:10001378-1785024000-1785110399@spacecalendar.com
SUMMARY:Soyuz MS-28 / Crew Return to Earth
DESCRIPTION:Sergey Kud-Sverchkov\, Sergey Mikayev and Christopher Williams set to undock from ISS in Soyuz MS-28\, triggering the start to Expedition 75 with Commander Jessica Meir.
URL:https://spacecalendar.com/event/soyuz-ms-28-crew-return-to-earth/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Mission Milestone
ATTACH;FMTTYPE=image/jpeg:https://spacecalendar.com/wp-content/uploads/2026/07/Soyus-MS-28-Undock.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260830
DTEND;VALUE=DATE:20260831
DTSTAMP:20260707T000531Z
CREATED:20251024T201457Z
LAST-MODIFIED:20260707T000531Z
UID:10000470-1788048000-1788134399@spacecalendar.com
SUMMARY:14 Years in Space: Van Allen Probes
DESCRIPTION:NASA spacecraft surpasses another full year in space today\, launched 2012; adding to the understanding of Earth radiation belt environment and its variability.
URL:https://spacecalendar.com/event/van-allen-probes-mark-another-year-in-space/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260906
DTEND;VALUE=DATE:20260907
DTSTAMP:20260707T000605Z
CREATED:20251024T201457Z
LAST-MODIFIED:20260707T000605Z
UID:10000469-1788652800-1788739199@spacecalendar.com
SUMMARY:3rd Year in Space: X-Ray Imaging and Spectroscopy Mission (XRISM)
DESCRIPTION:Japan’s X-Ray Imaging and Spectroscopy Mission (XRISM)\, studying galactic plasma\, surpasses another full year in space today at ~550-km LEO\, having launched 2023.
URL:https://spacecalendar.com/event/x-ray-imaging-and-spectroscopy-mission-xrism-begins-next-year-in-space/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260928
DTEND;VALUE=DATE:20260929
DTSTAMP:20260714T024017Z
CREATED:20251024T201500Z
LAST-MODIFIED:20260714T024017Z
UID:10000498-1790553600-1790639999@spacecalendar.com
SUMMARY:11 Years in Space: India's Astrosat
DESCRIPTION:Indian Space Research Organisation (ISRO) first dedicated multi-wavelength space observatory surpasses another full year in space today\, launched 2015.
URL:https://spacecalendar.com/event/astrosat-begins-next-year-in-space/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261017
DTEND;VALUE=DATE:20261018
DTSTAMP:20260714T023530Z
CREATED:20251024T201459Z
LAST-MODIFIED:20260714T023530Z
UID:10000487-1792195200-1792281599@spacecalendar.com
SUMMARY:24 Years in Space: INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL)
DESCRIPTION:Detecting some of the most energetic radiation in space\, ESA\, NASA\, Roscosmos spacecraft surpasses another year of operations in space\, despite loss of its thrusters; launched 2002\, expected to run out of fuel early 2020s and fall to Earth Feb 2029.
URL:https://spacecalendar.com/event/international-gamma-ray-astrophysics-laboratory-integral-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261102
DTEND;VALUE=DATE:20261103
DTSTAMP:20260714T025347Z
CREATED:20251024T201458Z
LAST-MODIFIED:20260714T025347Z
UID:10000474-1793577600-1793663999@spacecalendar.com
SUMMARY:International Space Station: 26 Years of Continuous Human Occupation
DESCRIPTION:Today marks another full year of continuous Human occupation of ISS; first component Zarya launched Nov 20\, 1998\, occupation began Nov 2\, 2000.
URL:https://spacecalendar.com/event/international-space-station-begins-next-year-of-continuous-human-occupation/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Mission Milestone,Observation / Anniversary
ATTACH;FMTTYPE=image/jpeg:https://spacecalendar.com/wp-content/uploads/2025/10/ISS-Human-Occupation.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261120
DTEND;VALUE=DATE:20261121
DTSTAMP:20260714T004532Z
CREATED:20251024T201501Z
LAST-MODIFIED:20260714T004532Z
UID:10000512-1795132800-1795219199@spacecalendar.com
SUMMARY:22 Years in Space: Swift Spacecraft
DESCRIPTION:Observing gamma-ray bursts & their afterglows in gamma-ray\, X-ray\, ultraviolet\, optical wavelengths from LEO\, multiwavelength craft surpasses another year of operations in space today\, launched in 2004.
URL:https://spacecalendar.com/event/swift-spacecraft-begins-next-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261202
DTEND;VALUE=DATE:20261203
DTSTAMP:20260714T004654Z
CREATED:20251024T201501Z
LAST-MODIFIED:20260714T004654Z
UID:10000508-1796169600-1796255999@spacecalendar.com
SUMMARY:31 Years in Space: Solar and Heliospheric Observatory (SOHO)
DESCRIPTION:European Space Agency (ESA) / National Aeronautics and Space Administration (NASA) craft studying sun\, surpasses another full year of operations in space today\, launched 1995; discovered more than 3\,000 comets.
URL:https://spacecalendar.com/event/solar-and-heliospheric-observatory-soho-begins-next-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261210
DTEND;VALUE=DATE:20261211
DTSTAMP:20260714T004950Z
CREATED:20251024T201500Z
LAST-MODIFIED:20260714T004950Z
UID:10000500-1796860800-1796947199@spacecalendar.com
SUMMARY:27 Years in Space: XMM-Newton
DESCRIPTION:European Space Agency (ESA) craft in Very Eccentric Elliptical LEO studying X-ray emissions\, star-forming regions\, galaxy clusters\, environment of supermassive black holes\, mapping dark matter\, surpasses next full year in space today\, launched 1999.
URL:https://spacecalendar.com/event/xmm-newton-begins-next-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261214
DTEND;VALUE=DATE:20261215
DTSTAMP:20260707T011216Z
CREATED:20251024T201503Z
LAST-MODIFIED:20260707T011216Z
UID:10000547-1797206400-1797292799@spacecalendar.com
SUMMARY:17 Years in Space: WISE / NEOWISE
DESCRIPTION:NASA Wide-field Infrared Survey Explorer spacecraft (redubbed Near-Earth Object WISE – NEOWISE) surpasses another full year in space today; launched 2009\, went into hibernation February 17\, 2011 and reactivated August 21\, 2013.
URL:https://spacecalendar.com/event/wise-neowise-begins-next-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20270424
DTEND;VALUE=DATE:20270425
DTSTAMP:20260714T022940Z
CREATED:20251024T201503Z
LAST-MODIFIED:20260714T022940Z
UID:10000534-1808524800-1808611199@spacecalendar.com
SUMMARY:37 Years in Space: Hubble Space Telescope
DESCRIPTION:NASA spacecraft with 2.4-meter diameter main telescope begins 38th year in space today\, launched Apr 24\, 1990; could continue operations until 2040s.
URL:https://spacecalendar.com/event/hubble-space-telescope-begins-next-year-in-space/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20270605
DTEND;VALUE=DATE:20270606
DTSTAMP:20260703T022327Z
CREATED:20251024T201504Z
LAST-MODIFIED:20260703T022327Z
UID:10000550-1812153600-1812239999@spacecalendar.com
SUMMARY:Tiangong Space Station: 5 Years of Continuous Human Occupation
DESCRIPTION:Today marks 5th full year / starts 6th year of continuous Human occupation of TSS; Shenzhou 14 three-member crew launched on this day in 2022\, beginning occupation.
URL:https://spacecalendar.com/event/tiangong-space-station-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Mission Milestone,Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20270613
DTEND;VALUE=DATE:20270614
DTSTAMP:20260714T023702Z
CREATED:20251024T201504Z
LAST-MODIFIED:20260714T023702Z
UID:10000291-1812844800-1812931199@spacecalendar.com
SUMMARY:15 Years in Space: Nuclear Spectroscopic Telescope Array (NuSTAR)
DESCRIPTION:NASA\, Cal-tech high-energy astrophysics satellite surpasses another year in space\, having launched on this day in 2012.
URL:https://spacecalendar.com/event/nuclear-spectroscopic-telescope-array-nustar-begins-next-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20270830
DTEND;VALUE=DATE:20270831
DTSTAMP:20260714T003314Z
CREATED:20251024T201504Z
LAST-MODIFIED:20260714T003314Z
UID:10000559-1819584000-1819670399@spacecalendar.com
SUMMARY:15 Years in Space: Van Allen Probes
DESCRIPTION:NASA spacecraft surpasses another full year in space today\, launched 2012; adding to the understanding of Earth radiation belt environment and its variability.
URL:https://spacecalendar.com/event/van-allen-probes-mark-another-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20270906
DTEND;VALUE=DATE:20270907
DTSTAMP:20260704T001042Z
CREATED:20251024T201504Z
LAST-MODIFIED:20260704T001042Z
UID:10000557-1820188800-1820275199@spacecalendar.com
SUMMARY:4th Year in Space: X-Ray Imaging and Spectroscopy Mission (XRISM)
DESCRIPTION:Japan’s X-Ray Imaging and Spectroscopy Mission (XRISM)\, studying galactic plasma\, surpasses another full year in space today at ~550-km LEO\, having launched 2023.
URL:https://spacecalendar.com/event/x-ray-imaging-and-spectroscopy-mission-xrism-begins-next-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20270928
DTEND;VALUE=DATE:20270929
DTSTAMP:20260714T024021Z
CREATED:20251024T201504Z
LAST-MODIFIED:20260714T024021Z
UID:10000553-1822089600-1822175999@spacecalendar.com
SUMMARY:12 Years in Space: India's
DESCRIPTION:Indian Space Research Organisation (ISRO) first dedicated multi-wavelength space observatory surpasses another full year in space today\, launched 2015.
URL:https://spacecalendar.com/event/astrosat-begins-next-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20271017
DTEND;VALUE=DATE:20271018
DTSTAMP:20260714T023518Z
CREATED:20251024T200727Z
LAST-MODIFIED:20260714T023518Z
UID:10000459-1823731200-1823817599@spacecalendar.com
SUMMARY:25 Years in Space: INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL)
DESCRIPTION:Detecting some of the most energetic radiation in space\, ESA\, NASA\, Roscosmos spacecraft surpasses another year of operations in space\, despite loss of its thrusters; launched 2002\, expected to run out of fuel early 2020s and fall to Earth Feb 2029.
URL:https://spacecalendar.com/event/international-gamma-ray-astrophysics-laboratory-integral-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20271102
DTEND;VALUE=DATE:20271103
DTSTAMP:20260714T025433Z
CREATED:20251024T200726Z
LAST-MODIFIED:20260714T025433Z
UID:10000444-1825113600-1825199999@spacecalendar.com
SUMMARY:International Space Station: 27 Years of Continuous Human Occupation
DESCRIPTION:Today marks another full year of continuous Human occupation of ISS; first component Zarya launched Nov 20\, 1998\, occupation began Nov 2\, 2000.
URL:https://spacecalendar.com/event/international-space-station-begins-next-year-of-continuous-human-occupation-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Mission Milestone,Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20271120
DTEND;VALUE=DATE:20271121
DTSTAMP:20260714T004536Z
CREATED:20251024T200726Z
LAST-MODIFIED:20260714T004536Z
UID:10000445-1826668800-1826755199@spacecalendar.com
SUMMARY:23 Years in Space: Swift Spacecraft
DESCRIPTION:Observing gamma-ray bursts & their afterglows in gamma-ray\, X-ray\, ultraviolet\, optical wavelengths from LEO\, multiwavelength craft surpasses another year of operations in space today\, launched in 2004.
URL:https://spacecalendar.com/event/swift-spacecraft-begins-next-year-in-space-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20271202
DTEND;VALUE=DATE:20271203
DTSTAMP:20260714T004649Z
CREATED:20251024T200724Z
LAST-MODIFIED:20260714T004649Z
UID:10000441-1827705600-1827791999@spacecalendar.com
SUMMARY:32 Years in Space: Solar and Heliospheric Observatory (SOHO)
DESCRIPTION:European Space Agency (ESA) / National Aeronautics and Space Administration (NASA) craft studying sun\, surpasses another full year of operations in space today\, launched 1995; discovered more than 3\,000 comets.
URL:https://spacecalendar.com/event/solar-and-heliospheric-observatory-soho-begins-next-year-in-space-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20271210
DTEND;VALUE=DATE:20271211
DTSTAMP:20260714T004946Z
CREATED:20251024T200724Z
LAST-MODIFIED:20260714T004946Z
UID:10000227-1828396800-1828483199@spacecalendar.com
SUMMARY:28 Years in Space: XMM-Newton
DESCRIPTION:European Space Agency (ESA) craft in Very Eccentric Elliptical LEO studying X-ray emissions\, star-forming regions\, galaxy clusters\, environment of supermassive black holes\, mapping dark matter\, surpasses next full year in space today\, launched 1999.
URL:https://spacecalendar.com/event/xmm-newton-begins-next-year-in-space-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20271214
DTEND;VALUE=DATE:20271215
DTSTAMP:20260707T011125Z
CREATED:20251024T200723Z
LAST-MODIFIED:20260707T011125Z
UID:10000223-1828742400-1828828799@spacecalendar.com
SUMMARY:18 Years in Space: WISE / NEOWISE
DESCRIPTION:NASA Wide-field Infrared Survey Explorer spacecraft (redubbed Near-Earth Object WISE – NEOWISE) surpasses another full year in space today; launched 2009\, went into hibernation February 17\, 2011 and reactivated August 21\, 2013.
URL:https://spacecalendar.com/event/wise-neowise-begins-next-year-in-space-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20280424
DTEND;VALUE=DATE:20280425
DTSTAMP:20260714T022901Z
CREATED:20251024T200721Z
LAST-MODIFIED:20260714T022901Z
UID:10000402-1840147200-1840233599@spacecalendar.com
SUMMARY:38 Years in Space: Hubble Space Telescope
DESCRIPTION:NASA spacecraft with 2.4-meter diameter main telescope launched Apr 24\, 1990; could continue operations until 2040s.
URL:https://spacecalendar.com/event/hubble-space-telescope-begins-next-year-in-space-2/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20280605
DTEND;VALUE=DATE:20280606
DTSTAMP:20260714T025800Z
CREATED:20240124T200721Z
LAST-MODIFIED:20260714T025800Z
UID:10000014-1843776000-1843862399@spacecalendar.com
SUMMARY:Tiangong Space Station: 6 Years of Continuous Human Occupation
DESCRIPTION:Today marks 6th full year / starts 7th year of continuous Human occupation of TSS; Shenzhou 14 three-member crew launched on this day in 2022\, beginning occupation.
URL:https://spacecalendar.com/event/tiangong-space-station-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Mission Milestone,Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20280830
DTEND;VALUE=DATE:20280831
DTSTAMP:20260714T003326Z
CREATED:20251024T200719Z
LAST-MODIFIED:20260714T003326Z
UID:10000189-1851206400-1851292799@spacecalendar.com
SUMMARY:16 Years in Space: Van Allen Probes
DESCRIPTION:NASA spacecraft surpasses another full year in space today\, launched 2012; adding to the understanding of Earth radiation belt environment and its variability.
URL:https://spacecalendar.com/event/van-allen-probes-mark-another-year-in-space-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20280906
DTEND;VALUE=DATE:20280907
DTSTAMP:20260704T001055Z
CREATED:20251024T200718Z
LAST-MODIFIED:20260704T001055Z
UID:10000394-1851811200-1851897599@spacecalendar.com
SUMMARY:5th Year in Space: X-Ray Imaging and Spectroscopy Mission (XRISM)
DESCRIPTION:Japan’s X-Ray Imaging and Spectroscopy Mission (XRISM)\, studying galactic plasma\, surpasses another full year in space today at ~550-km LEO\, having launched 2023.
URL:https://spacecalendar.com/event/x-ray-imaging-and-spectroscopy-mission-xrism-begins-next-year-in-space-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20280928
DTEND;VALUE=DATE:20280929
DTSTAMP:20260714T024025Z
CREATED:20251024T200718Z
LAST-MODIFIED:20260714T024025Z
UID:10000389-1853712000-1853798399@spacecalendar.com
SUMMARY:13 Years in Space: India's Astrosat
DESCRIPTION:Indian Space Research Organisation (ISRO) first dedicated multi-wavelength space observatory surpasses another full year in space today\, launched 2015.
URL:https://spacecalendar.com/event/astrosat-begins-next-year-in-space-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20281017
DTEND;VALUE=DATE:20281018
DTSTAMP:20260714T023440Z
CREATED:20251024T200717Z
LAST-MODIFIED:20260714T023440Z
UID:10000387-1855353600-1855439999@spacecalendar.com
SUMMARY:26 Years in Space: INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL)
DESCRIPTION:Detecting some of the most energetic radiation in space\, ESA\, NASA\, Roscosmos spacecraft surpasses another year of operations in space\, despite loss of its thrusters; launched 2002\, instruments were officially powered down in February 2025\, and planned reentry into Earth’s atmosphere expected Feb 2029.
URL:https://spacecalendar.com/event/international-gamma-ray-astrophysics-laboratory-integral-4/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Observation / Anniversary
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20281102
DTEND;VALUE=DATE:20281103
DTSTAMP:20260714T025537Z
CREATED:20251024T200717Z
LAST-MODIFIED:20260714T025537Z
UID:10000372-1856736000-1856822399@spacecalendar.com
SUMMARY:International Space Station: 28 Years of Continuous Human Occupation
DESCRIPTION:Today marks another full year of continuous Human occupation of ISS; first component Zarya launched Nov 20\, 1998\, occupation began Nov 2\, 2000.
URL:https://spacecalendar.com/event/international-space-station-begins-next-year-of-continuous-human-occupation-3/
LOCATION:Low Earth Orbit (LEO)
CATEGORIES:Mission Milestone,Observation / Anniversary
END:VEVENT
END:VCALENDAR