To prohibit any reduction in the amount of the per diem allowance to which members of the uniformed services or civilian employees of the Department of Defense are entitled based on the duration of temporary duty assignments or official travel, and for other purposes.

Prohibits uniformed service agencies or the Department of Defense (DOD) from altering the amount of the locality-based travel and transportation per diem allowances or reimbursements to which certain uniformed service members or civilian DOD employees are entitled based on the duration of temporary duty assignments or official travel in a locality.

Nullifies the DOD policy implemented on November 1, 2014, regarding reductions in per diem allowances based on the duration of temporary duty assignments or civilian travel.