Colonel Jason Duke (front right) relieved Colonel Vasilios Pappas (front left) as the commanding officer of the USMC H-1 Light/Attack Helicopter Program Office (PMA-276) during a change of command ceremony at the Air Test and Evaluation Squadron Two One’s (HX-21) hangar on Naval Air Station Patuxent River, Mar. 20. Standing at attention (back left) is Brigadier General David Walsh.