Oct. 25, 2021 Holloman High Speed Test Track completes two recovery missions at over 5,000-feet per second Since July 2021, the 846th Test Squadron at Holloman Air Force Base, N.M., successfully stopped two sleds traveling over 5,000-feet per second on a monorail as part of the Hypersonic Sled Recovery, or HSR, effort.According to Daniel Lopez, project manager for the test that was completed in July, the