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On this day – April 28

Posted on April 28, 2025April 2, 2025 By Barb Sande

The events on this day in history for our heritage companies are noted below.

The earliest event was in 1955, the latest event was in 1991.

Three milestone events (5 to 65+ years ago)

Human Spaceflight:

1961 – MM Dyna-Soar launch by Saturn I launch vehicle studied

1991 – LAUNCH: STS-39 (Discovery) LC39B, KSC – 7 person crew, deployed military payloads. Crew: Mike Coats, L. Blaine Hammond, Gregory Harbaugh, Donald McMonagle, Guion Bluford, Charles Veach, Richard Hieb. 

Military and Classified Programs:

1965 – LAUNCH: Classified mission, GD Atlas SLV-3/Lockheed Agena D, SLCE, VAFB – MILESTONE: 60 years ago

1968 – LAUNCH: Vela 7, 8, MM Titan IIIC, LC41, CCAFS

Exploration and Interplanetary Programs:

NONE

Earth-Monitoring and Civil Weather Satellite programs:

NONE

Commercial Programs:

NONE

Test, ICBM, FBM programs:

1955 – Secretary of the USAF approved the development of the alternative ICBM (Martin Titan I) from concepts started in January 1955  – MILESTONE: 70 years ago

1960 – LAUNCH: Martin Titan I, LC16, CCAFS – MILESTONE: 65 years ago

1973 – LAUNCH: Lockheed Poseidon C3, SSBN654, ETR

1988 – LAUNCH: Lockheed Trident D5, LC46, CCAFS

Other:

NONE

The photos today are from the STS-39 mission in 1991, including the launch, the crew and an ionization experiment.  STS-39 was the last mission commanded by Mike Coats and the mission crew performed  a series of military experiments and classified payload deployments.  Photo Credits: NASA. 

April 28 – STS-39 DISCOVERY LAUNCH. THE FIRST UNCLASSIFIED DEPARTMENT OF DEFENSE (DOD) MISSION. Photo Credit: NASA.
April 28 – Crew of STS-39 (see text for crew names). Photo Credit: NASA.
April 28 – Ionization experiment on STS-39. Photo Credit: NASA.
On This Day

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