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On this day – April 15

Posted on April 15, 2025March 26, 2025 By Barb Sande

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

The earliest event was in 1892 (not a typo), the latest event was in 2011

Two milestone events (5 to 65+ years ago)

Human Spaceflight:

1959 – Army Ordnance Missile Command recommended using a Martin Titan for the second stage of the Saturn rocket, in correspondence sent to ARPA

1964 – Gemini Program Management Panel remained optimistic that the Titan II/Gemini program would have its first manned launch later in that same year (it ended up being moved into 1965). 

1966 – A Lockheed proposal was submitted to NASA to evaluate launching payloads in space using Agena stages from the Apollo Applications Platform

Military and Classified Programs:

1960 – LAUNCH: Lockheed Discoverer 11, Thor/Lockheed Agena A, SLC1E, VAFB – MILESTONE: 65 years ago

1969 – LAUNCH: Classified mission, MM Titan IIIB, SLC4W, VAFB

1970 – LAUNCH: Classified mission, MM Titan 23B, SLC4W, VAFB – MILESTONE: 55 years ago

1983 – LAUNCH: Classified mission, MM TItan 24B, SLC4W, VAFB

2011 – LAUNCH: USA 229, ULA Atlas V 411, SLC3E, VAFB

Exploration and Interplanetary Programs:

NONE

Earth-Monitoring and Civil Weather Satellite programs:

1999 – LAUNCH: LM Landsat 7, Delta 7920-10, SLC2W, VAFB

Commercial Programs:

NONE

Test, ICBM, FBM programs:

1965 – The last MM Titan I was removed from its silo, Lowry AFB, Colorado – MILESTONE: 60 years ago

1988 – LAUNCH (4): Lockheed Trident C4, SSBN658, ETR

1991 – LAUNCH: Lockheed Trident D5, SSBN736, ETR

Other:

1892 – General Electric company is founded

The photos today are of the launch of Landsat 7, a photo of the spacecraft being processed and an example of earth monitoring data from this spacecraft, which was finally decommissioned in 2022.  Photo Credits: NASA.

April 15 – Launch of Landsat 7 on Delta II. Photo Credit: NASA.
April 15 – Landsat 7 undergoing assembly and test. Photo Credit: NASA.
April 15 – Imagery from Landsat 7. Photo Credit: NASA.
On This Day

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