Ty Colvin (left), wife of Capt. Neil Colvin, 91st Security Forces Group Tactical Response Force operations officer, and Senior Airman Richard Ste Croix, 91st SFS TRF marksman, works with TRF volunteers in a doctoral physical assessment here, Sept. 9. TRF volunteers performed exercises with and without full battle gear to demonstrate how the gear makes movement difficult. TRF volunteers are currently participating in a doctoral study which assesses any physical weaknesses or injuries they may have. The assessment has the potential to significantly reduce injuries in the Air Force. (U.S. Air Force photo/Senior Airman Ashley N. Avecilla)