Technical Sergeant Sean Becker from the 104th Fighter Wing, Massachusetts Air National Guard refills the oxygen system on an F-15 Eagal before a sortie on April 11, 2011. Deployed to Tyndall Air Force Base in Florida, the 104th is participating in the Weapons System Evaluation Program (WSEP). The two week training and evaluation program is important for ground crews to test their maintenance systems and processes while loading live munitions on F-15 Eagles, as well as critical live training for the F-15 pilots to employ air-to-air missiles against real world targets. (U.S. Air Force Photo by: Master Sergeant, Mark W. Fortin)
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/thenationalguard/5817998751/">Massachusetts National Guard member refills oxygen system on F-15 Fighter aircraft</a>