The SR-71 Blackhawk was in service with the U.S. Air Force from 1964 to 1998. Since 1976, it has held the world record for the fastest air-breathing manned aircraft at over Mach 3. This T-shirt has been in service since the early 90′s and fits a lot tighter than when it was first purchased. Did you know pilots in a pressure suit can lose up to 5 pounds in a four hour flight? Time to fly!