Caleb Truman (2065–) was one of the initial resident subjects of Vault 75 in 2077.
A citizen of Malden, Massachusetts, Caleb's enrollment in Vault 75 was subsidized by the federal government as part of the Vault's experiment. He was separated from his parents (whom if entered the vault were murdered) and cared for by robots and continually tested (a process starting in 2078) until his eighteenth birthday. Wherein he, along with the rest of the resident population, all "graduated" from the training program. It is unclear if his fate was that of becoming part of the Research staff or being culled.
Caleb Truman is mentioned only in Fallout 4.