Do I have to use DoD preferred commercial lodging?
Policy. The Joint Travel Regulations (JTR) [PDF] require DoD travelers on temporary duty (TDY) to an Integrated Lodging Program site or surrounding metro area to book DoD Preferred commercial lodging before other commercial lodging options.
People Also Ask
Yes, the Joint Travel Regulations [PDF], par. 020303 requires DoD civilians that are TDY/TAD to a military installation at an Integrated Lodging Program location to book government quarters (if available) unless an exemption (as outlined in the JTR) applies.
A per diem is money that you get to spend on food and other incidentals (including tips and phone calls). If you are away on travel for more than 12 hours and more than 50 miles from home, then you are eligible for 3/4 per diem. If you are away less than 12 hours, you do not get per diem.