Space Shuttle Flight 34 (STS-36) [DOD Mission, no sound] 

Perhaps I'm being insensitive or ignorant here, but I have very mixed feelings toward these DoD missions. I think they were only realized to justify the enormous costs that NASA had with the Shuttle program to the U.S. Congress, same with the Spacelab missions (which were also important) but I also don't see them as completely crucial in the long run, as opposed to a space station construction (which was the whole point of the Shuttles existence).