Atlantis Ready For Its Final Mission

8 - 5 April 1991 - STS-37 - 39B - Edwards AFB - 5 days, 23 hours, 32 minutes, 44 seconds - 2,487,075 miles (4,002,559 km) - Deployed Compton Gamma Ray Observatory (GRO), the second of the Great Observatories program.
9 - 2 August 1991 - STS-43 - 39A - KSC - 8 days, 21 hours, 21 minutes, 25 seconds - 3,700,400 miles (5,955,200 km) - Deployed Tracking and Data Relay Satellite-5 (TDRS-5 or TDRS-E).
10 - 24 November 1991 - STS-44 - 39A - Edwards AFB - 6 days, 22 hours, 50 minutes, 44 seconds - 2,890,067 miles (4,651,112 km) - Mission dedicated to Department of Defense. The unclassified payload included a Defense Support Program (DSP) satellite deployed on flight day one.
11 - 24 March 1992 - STS-45 - 39A - KSC - 8 days, 22 hours, 9 minutes 28 seconds - 3,274,946 miles (5,270,515 km) - Carried first Atmospheric Laboratory for Applications and Science (ATLAS-1). ATLAS-1 equipped with 12 instruments conducted studies in atmospheric chemistry, solar radiation, space plasma physics and ultraviolet astronomy.