bubble head
 n.— «The 2d Class Diver badge “bubble head” was authorized for wear in 1974. The recipients of both parachutist and diver insignia are considered “dual-qualified” (or “dual-cool”) full-fledged “Reconnaissance Marines.”» —by Charles D. Melson Marine Recon 1940-90 Sept. 12, 1994. (source: Double-Tongued Dictionary)

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