160317-N-OY799-013 PATUXENT RIVER, Md. (March 17, 2016) Aviation Structural Mechanic Airman Darryl Collins, assigned to Air Test and Evaluation Squadron (VX) 1, takes the Navy-wide E-4 advancement exam at River Edge on Naval Air Station Patuxent River. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kenneth Abbate/Released)