Seabee combat warfare specialist insignia

The Seabee Combat Warfare Specialist (SCWS) insignia is a warfare qualification of the United States Navy. To be eligible to earn the SCWS insignia, personnel must first be assigned to a qualifying unit of the Naval Construction Force (Seabees) such as Naval Mobile Construction Battalions (NMCB), Underwater Construction Teams (UCT), and Construction Battalion Maintenance Units (CBMU), as well as personnel assigned to Amphibious Construction Battalions (ACB).

Source: Wikipedia — Seabee combat warfare specialist insignia (CC BY-SA 4.0)