Per his military service record (Depot), Frederick Jennings was born in New York. He gave his age as 40 years and 3 months, his marital status as single, and his occupation as labourer & sailor. His description on his Certificate of Medical Examination form was 5 feet 7 inches tall, weight 10 stone, with a dark complexion, brown eyes, and dark hair. His religious denomination was recorded as being Church of England. He claimed that 3 years previous military experience apprenticed in the American Army.
His next of kin was recorded on his Attestation Paper of Persons Enlisted for Service Abroad form as his brother, Michael Jennings, New York, U.S.A.
Frederick Jennings stated in a Statutory Declaration in his service record that he joined the Route March of recruits marching from Gilgandra to Sydney at Wellington. He completed his medical examination at Wellington on 16th October 1915, and was attested at Wellington on 18th October 1915.
After completing the Coo-ee March he went to Liverpool Camp as reinforcement for the 13th Battalion.
On 17th November 1915. Private Jennings went before a Medical Board at Liverpool Camp, where he was found to be unfit for military service due to Varicose Veins.
Private Jennings was discharged medically unfit on 29th November 1915.
 NAA: B2455, JENNINGS FREDERICK