These fittings are military unique because they are intended for use in military aircraft and missile systems that use high pressure (3,000 psi) and high temperature (-65°F to +160ºF) pneumatic and (-65°F to +400°F) hydraulic systems. Medium pressure pneumatic storage system applications are not recommended. These fittings are capable of withstanding the severe environment encountered in military applications. Installations in which the limits specified herein are exceeded, or in which the application is not covered specifically by this specification will be subject to the approval of the acquiring activity.