SHIELDTierced in gyrons bendwise inverted Azure, Celeste fimbriated Argent, and of the first, an anchor with shank terminating in a mace-head bendwise sinister Or.
From a wreath Argent and Azure the head of a watchdog erased Proper superimposed by a hunting horn Or garnished Gules.
A U.S. Navy sword and a trident saltirewise Proper.
A scroll Argent edged Gules doubled and inscribed "SECOND TO NONE" Azure.
The coat of arms as blazoned in full color upon a white disc edged with a gold rope and inscribed "USS WHIRLWIND" at top and "PC 11" in base in blue.
SHIELDDark blue and gold are the colors traditionally associated with the U.S. Navy. Celeste, or light blue, represents coastal waters and the Caribbean where much of the USS WHIRLWIND's patrol mission is carried out. White stands for integrity. The shield is divided to simulate the vortex of a whirlwind from which PC 11 takes its name. The anchor combined with the head of a medieval mace denotes authority at sea and the weaponry to implement the duties of the mission. Gold stands for excellence.
The watchdog signifies fighting spirit, vigilance and diligence in duty and recalls the escort mission of the first ship (SP 221) to bear the name Whirlwind. The hunting horn emphasizes the mission of the USS WHIRLWIND in interdiction operations and the detection of illegal activities. Gold and scarlet stand for excellence and courage.
The trident, adapted from the Naval Special Warfare insignia, is crossed with a Navy sword and refers to the ship's mission of providing support for the Special Warfare Forces.