STS-51D Mission Insignia

The dominant features of the STS-51D emblem are an orbit formed by a Colonial American flag and a Space Shuttle. The flag in orbit signifies the U.S. flag to indicate that it comes from this country and the American people. The original 13- star flag is used to symbolize a continuity of technical achievement and progress since colonial times. The name Discovery preceding the flag represents the spirit of Discovery and exploration of new frontiers which have been a hallmark of American people even before they were formed together as a nation.