Senior Airman Michael Crowley, 434th Maintainence Squadron communications navigation specialist, and Tech Sgt. Christopher Lannister, 434th MXS communications navigation specialist, test the tactical air collision avoidance system on a KC-135R at Grissom Air Reserve Base, Ind., March 5th, 2017. The maintainance was part of an isochronal inspection, in which every system on the aircraft is inspected for damage and signs of wear once every two years. ( Air Force

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Keywords: 434, america, arb, armed, arw, defence, employee, federal, forces, government, grissom, kc-135, military, mxs, service, states, united, usa