He has logged over 4,500 hours in 15 American and 10 RAF aircraft.
Colonel Hammond flew as pilot of Discovery on STS-39, the first unclassified Department of Defense mission (April 28 to May 6, 1991). He logged 199 hours and 23 minutes of space flight. The seven-man crew performed numerous scientific experiments to collect data on atmospheric infrared and ultraviolet phenomena including a deploy and rendezvous in support of the Strategic Defense Initiative Office (SDIO).
Recently, he was the pilot on STS-64 aboard the Space Shuttle Discovery. Mission highlights included: first use of lasers for environmental research; deployment and retrieval of a solar science satellite; robotic processing of semiconductors; use of RMS boom for jet thruster research; first untethered spacewalk in 10 years to test a self-rescue jetpack. Mission duration was 10 days, 22 hours, 51 minutes.
Following STS-64, Hammond completed 5 months of intensive Russian language training as preparation for assignment as the Deputy for Operations, Russia. That assignment was subsequently changed to NASA Liaison to USAF HQ/AFSPC, Colorado Springs, where he worked several issues to strengthen ties between NASA, AFSPC, and USAF Astronauts. Hammond was also assigned as Lead Ascent/Entry CAPCOM for missions STS-73 through STS-78. During the same period, Hammond served as the Branch Chief of the Flight Support Branch, supervising CAPCOM and ASP activities. Hammond is currently assigned as the Branch Chief of the Astronaut Office Safety Branch where he monitors all T-38, Shuttle, and Space Station safety issues.
Manned seven crew. Deployed USA 70, CRO A, CRO B, CRO C; deployed and retrieved IBSS. Payloads: Infrared Background Signature Survey (lBSS), Air Force Program (AFP)-675, Space Test Payload (STP)-I, Multi-Purpose Experiment Canister (MPEC), Cloud Logic to Optimize Use of Defense Systems (CLOUDS)-1A, Radiation Monitoring Equipment (RME)-lll.
Payloads: Lidar In-Space Technology Experiment (LITE), Shuttle Pointed Autonomous Research Tool for Astronomy (SPARTAN) 201-II, Robot-Operated Materials Processing System (ROMPS), Shuttle Plume Impingement Flight Experiment (SPIFEX), getaway special (GAS) bridge assembly with ten GAS experiments, Trajectory Control Sensor (TCS), Simplified Aid for EVA Rescue (SAFER), Solid Surface Combustion Experiment (SSCE), Biological Research in Canisters (BRIC) III, Radiation Monitoring Experiment (RME) III, Military Applications of Ship Tracks (MAST), Shuttle Amateur Radio Experiment (SAREX) II, Air Force Maui Optical Site (AMOS) Calibration Test.