Construction workers in World War II in the Pacific are needed to build military sites, but the work is dangerous and they doubt the ability of the Navy to protect them. After a series of attacks by the Japanese, something new is tried, Construction Battalions (CBs=Seabees). The new CBs have to both build and be ready to fight.
Paratroopers Captain ‘Rip’ Murdock and Sergeant Johnny Drake are mysteriously ordered to travel to Washington, DC. When Drake learns that he is to be awarded the Medal of Honor, he disappears before newspaper photographers can take his picture. Murdock follows the clues and tracks him down, where he learns Drake is dead. Further investigations reveal unexpected twists. Rip learns that Johnny had been accused of murder and sets out to find out whatever he can. He falls in love with Coral whose husband Johnny is supposed to have killed.