Per his military service record (regimental no. 2354), John Hogan was born at Gunnedah, N.S.W. He gave his age as 45 years, his marital status as single, and his occupation as labourer. His description on his Certificate of Medical Examination was height 5 feet 9 inches tall, weight 154 lbs., with a dark complexion, blue eyes, and dark hair. His religious denomination was Roman Catholic.
He completed his medical examination at Wellington on 17th October 1915 (the day the Coo-ees rested at Wellington), and was attested by Captain T. A. Nicholas at Stuart Town on 19th October 1915. He claimed to have previous military service in the Boer War.
After completing the Coo-ee March he went Menangle Light Horse Camp as reinforcement for the 7th Light Horse Regiment.
On his embarkation roll his address as time of enrolment was Wellington, N.S.W., and his next of kin is listed was listed as friend, James William Hoy, Hermitage Flat, Lithgow, N.S.W.
Trooper Hogan departed Sydney on the HMAT Palermo A56 on 18th April 1916, with the 16th Reinforcements for the 7th Light Horse Regiment.
After arriving in Egypt he was taken on strength by the 2nd Light Horse Training Regiment at Tel-el Kebir on 10th June 1916.
On 6th July 1916 he was taken on strength of the 2nd Double Squadron at Serapeum.
On 30th July 1916 Trooper Hogan he was transferred to the 1st Field Squadron Engineers Australian and New Zealand Mounted Division at Kantara, Egypt.
On 30th September 1917 Sapper Hogan was detached for duty with the Gamli Light Railway.
On 25th January 1918 he was sent to the military Dump at Ludd, Palestine.
He returned to his unit on 9th March 1919.
Sapper Hogan began his return to Australia on 3rd July 1919, aboard the H.T. Malta at Kantara, Egypt.
Sapper Hogan arrived in Australia on 10th August 1919.
He was discharged Termination of Period of Enlistment on 25th September 1919.
 NAA: B2455, HOGAN J 2354
 Australia War Memorial. First World War Embarkation Rolls, John Hogan 2354, HMAT Palermo A56, 18th April 1916.