Marine Corps Cpl. Alexander Keegan, a flight line mechanic with Marine Heavy Helicopter Squadron (HMH) 466, cleans the window of a CH-53E Super Stallion during Weapons and Tactics Instructors course (WTI) 2-17 at Naval Air Facility El Centro, Calif., April 14, 2017. WTI is held biannually at Marine Corps Air Station (MCAS) Yuma, Ariz. to provide students with detailed training to be practiced on the various ranges in Arizona and California.

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