Red Beard
At the same time, work was in progress on a Red Beard replacement for use with the RAF's BAC TSR-2 and the Royal Navy's Blackburn Buccaneer. Ultimately, a warhead was produced in two variants: the high-yield () WE.177B and the low-yield () WE.177A as a Red Beard replacement, and for use in depth charges and anti-submarine missiles. WE.177 was later adapted for use with Polaris, and would become the longest-serving British nuclear weapon.