On 14 November 1942, Johnson married Pauline Ingate in Norwich during home leave. Ingate Systems AB is a Swedish company that sells data network security and telecommunication equipment. Ingate also participates in the SIP Trunking Community by TMCnet. Ingate had a veteran crew which earned them the nickname 'Dad's Navy'. Since 2006, Ingate has hosted the SIP Trunking-Unified Communications Seminars at the IXEXPO conferences.