AF travelers reminded of flat rate per diem policy Published Nov. 19, 2017 By Ed Shannon Air Force Installation and Mission Support Center Public Affairs Joint Base San Antonio-Lackland, Texas (AFNS) -- Some Air Force travelers may not be aware of a flat rate per diem policy established a few years ago that focused on extended temporary duty travel. Congress instituted the flat rate in November 2014. The new policy reduced per diem from 100 percent to 75 percent for TDYs from 31 to 180 days and to 50 percent for TDYs over 180 days. Air Force Installation and Mission Support Center finance officials encourage Air Force travelers whose temporary duty travel exceeds 30 days and their approving officials to be knowledgeable of the policy. “We want to make sure Air Force travelers and approving officials understand the policy when creating travel authorizations and filing vouchers so that payments can be made timely and accurately,” said Col. Burke Beaumont, deputy director of AFIMSC’s Resource Management Directorate. Flat rate per diem information is available at the Defense Travel Management Office website at http://www.defensetravel.dod.mil.