An aircraft mechanic Marine with Marine Aviation Weapons and Tactics Squadron 1 wipes down the tail of an AH-1W Super Cobra helicopter during a routine maintenance inspection during Weapons and Tactics Instructor course 2-15 aboard Marine Corps Air Station Yuma, Arizona, April 22, 2015. The maintenance that they provide ensures all pilot candidates complete every mission safely. WTI is a seven-week course hosted by MAWTS-1 that provides advanced tactical training to certify Marine pilots as weapons and tactics instructors, preparing them to return to the fleet and serve in key training officer billets. (U.S. Marine Corps photo by Sgt. Cody Haas) - An aircraft mechanic Marine with Marine Aviation Weapons and Tactics Squadron 1 wipes down the tail of an AH-1W Super Cobra helicopter during a routine maintenance inspection during Weapons and Tactics Instructor course 2-15 aboard Marine Corps Air Station Yuma, Arizona, April 22, 2015. The maintenance that they provide ensures all pilot candidates complete every mission safely. WTI is a seven-week course hosted by MAWTS-1 that provides advanced tactical training to certify Marine pilots as weapons and tactics instructors, preparing them to return to the fleet and serve in key training officer billets. (U.S. Marine Corps photo by Sgt. Cody Haas)