U.S. Navy CHIEF Aviation Machinist's Mate Bruce Boyle and Aviation Machinist's Mate 1ST Class Steven Neitz, both assigned to Patrol Squadron (VP) 16, reference a technical manual while installing an auxiliary power unit (APU) to its cradle. APU's provide electric power to start the engines and power electrical equipment on aircraft, at Sigonella, Sicily. (U.S. Navy PHOTO by Mass Communication SPECIALIST 1ST Class Mark Anthony Geil) (Released)

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