Captain Frederick John Holroyd is a former British soldier who was based at the British Army's 3 Brigade HQ in mid-Ulster, Northern Ireland during the 1970s. He enlisted as a gunner in the Royal Artillery, and three years later, in 1964, he was commissioned into the Royal Army Service Corps (later the Royal Corps of Transport). He volunteered for the Special Military Intelligence Unit in Northern Ireland in 1969, and he was trained at the Joint Services School of Intelligence. Once his training was finished, he was stationed in Portadown, where, for two and a half years up to 1975, he ran a series of intelligence operations. He resigned from the Army in 1976.