SSBN Deterrent Patrol insignia

The SSBN Deterrent Patrol Insignia is a uniform breast pin worn by officers and enlisted sailors of the United States Navy's submarine service who have completed strategic deterrent patrols in nuclear ballistic or cruise missile submarines. It is awarded for different criteria than the Submarine Combat Patrol Insignia awarded for submarine patrols during World War II. Design of the SSBN pin shows a silver Lafayette-class submarine with superimposed Polaris missile and electron rings which signify the armament and nuclear-powered characteristics of the Fleet Ballistic Missile Deterrent Force.

Source: Wikipedia — SSBN Deterrent Patrol insignia (CC BY-SA 4.0)