STENNIS SPACE CENTER, Miss. -- John C. Stennis Space Center in South Mississippi is known as the location where rocket engines are tested by NASA and commercial companies, but it's also a major military training location. In this photo, Marine Corps reservists perform free-fall jumps at the installation in Hancock County, Miss., Dec. 14, 2017, to maintain tactical proficiency. (Source: Marine Corps photo by Lance Cpl. Tessa D. Watts, 12/20/17)
