This specification covers the performance requirements for circular and rectangular, plug and receptacle style, multiple removable genderless termini, fiber optic connectors that are for Department of Defense applications and that are compatible with multiple transmission element cables. Fiber optic connectors specified herein cover a family of general purpose, interconnection hardware providing a variety of compatible optical coupling arrangements. Connector parts specified within this specification include connector shells, connector inserts, connector backshells, connector backshell accessories, and connector dust caps.