Blackjack HX-21 Squadron Insignia - Naval Aviation Heritage #30653 (License: Personal Use)

This official insignia represents Helicopter Squadron 21 (HX-21), known as the “Blackjacks,” a U.S. Navy unit specializing in anti-submarine and search-and-rescue operations. The design integrates the King of Spades card motif-symbolizing strength and command-with a stylized sword and crossed anchors, reflecting maritime combat readiness. The banner text “BLACKJACK” and “HX-21” identifies the squadron’s call sign and designation.

Used on official Navy websites, squadron merchandise, aircraft markings, and historical exhibits; this image serves users seeking military aviation insignia details, squadron heritage, or visual assets for educational or commemorative purposes.