USMC historian Gordon L. Rottman wrote "that one of the biggest contributions the Navy made to the Marine Corps during WWII was the creation of the Seabees". In exchange, the Corps would be influential upon the CB organization and its history. After the experience of Guadalcanal the Department of War decided that the Marines and Seabees would make all subsequent landings together. That arrangement lead to numerous Seabee claims that they had landed first, even leaving signs on the beach asking the Marines "What took you so long?" The Seabees in the UDTs made an effort of this that their mates in the CBs approved of.