Boilerman

The Lancashire Tradesmen's Association organises craftsmen, semi-skilled and unskilled workmen on the surface other than the manipulators of coal, enginemen, boilermen and locomen; it also organises skilled craftsmen underground, although some craftsmen are organised by the Lancashire Area, which seeks to organise all underground workers including craftsmen.

Source: wiktionary

When the war in Korea began he was recalled by the Navy, serving as a boilerman technician. He came to New York in 1952, joined the Actors Studio and began to get parts both onstage and in films.

Source: wiktionary