In 2017, the US government spent $2.53B on Travel arrangements, reservation, planning, and support services. The agency which purchased the largest amount of Travel arrangements, reservation, planning, and support services in 2017 was USTRANSCOM ($1.13B), followed by Department of Veterans Affairs ($251M) and the U.S. Immigration and Customs Enforcement ($143M).
Accounting, management, administrative, and miscellaneous services
NAPCS Group