Five E-3 Sentries await preflight procedures to return to Tinker Air Force Base, Okla. May 21, 2013, at Davis-Monthan Air Force Base, Ariz. Seven aircraft arrived at Davis-Monthan AFB after inclement weather threatened Tinker AFB, May 20, 2013. (U.S. Air Force photo/Airman 1st Class Betty R. Chevalier)