Airman Calvin Daniels, 28th Maintenance Squadron aircrew egress system apprentice, performs adjustments on the drogue gun on an Advance Concept Ejection Seat II during a training session at Ellsworth Air Force Base, S.D., Jan. 23, 2012. The drogue gun uses a cartridge to propel a 1.2 pound slug into the airstream to deploy the drogue and extraction chute to stabilize the ACES II after an ejection. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)