STS-28 was a space shuttle mission by the US Department of Defense using the Space Shuttle Columbia and launched on 8 August 1989. It was the 30th shuttle mission, and the first flight of Columbia since mission STS-61-C. The details of the mission are classified. The payload is widely believed to have been the first SDS-2 communications satellite. The mission was launched successfully on 8 August 1989. STS-28 lasted just over 5 days and traveled 2.1 million miles in 81 orbits of the earth. The altitude of the mission is classified, but based on the distance traveled and number of orbits, the altitude would have been between 220 km and 380 km.

Being a classified mission, STS-28 has no commentary. (less info)