The outbreak of the Korean War led to a call-up of 10,000 from the Seabee Reserve. Seabees landed at Inchon during the assault, installing causeways dealing with enormous tides and enemy fire. Their actions there and elsewheres underscored the necessity of having CBs. During that war the authorized size of a CB was 550 men. When the truce was declared there was no CB demobilization as there had been at the end of World War II.