Planned date of fourth manned MOL mission at time of the program cancellation. From the beginning of the project, the Navy had demanded that this be an all-Navy crew, which would limit the crew to Truly, with either Overmeyer or Crippen as co-pilot.

Second manned captive active flight. Enterprise (OV-101)/shuttle carrier aircraft, Edwards (1 hour, 2 minutes)

Second free flight, ALT, tail cone on, Edwards (5 minutes, 28 seconds), Enterprise (OV-101), lake bed Runway 17

Fourth free flight, ALT, first tail cone off, Edwards (2 minutes, 34 seconds), Enterprise (OV-101), lake bed Runway 17

Second shuttle test flight. Payloads: Office of Space and Terrestrial Applications (OSTA)-1 experiments, Orbiter Experiments (OEX).

First night launch and night landing. Deployed Insat 1B. Payloads: Deployment of INSAT (lndia communica-tion satellite) with Payload Assist Module (PAM)-D, Payload Flight Test Article (PFTA)/ Payload Deployment Retrieval System (PDRS), Continuous Flow Electrophoresis (CFES), biomedical experiments. 250,000 express mail envelopes with special cachet for U.S. Postal Service were carried for a first-day cover.