Military Society

This Court has long recognized that the military is, by necessity, a specialized society separate from civilian society. We have also recognized that the military has, again by necessity, developed laws and traditions of its own during its long history. The differences between the military and civilian communities result from the fact that “it is the primary business of armies and navies to fight or be ready to fight wars should the occasion arise.” 

— William H. Rehnquist, Associate Justice, Supreme Court of the United States
Parker v. Levy, 417 U.S. 733, 743 (1974) (citation omitted)