such as categories A1, A2, A3, A4, C2, C3, D2, E5, F2, J, K and N as well as categories D3 (Sportsmen and Sportswomen) and H (Drivers/Mechanics), applicants must be between ages of 18 – 26 years by 30 June 2022. See the Educational Requirements for Entry into Each Category. Applicants must not be married or have children. The official policy of the U.S. Navy mandates that hair must be “kept neat, clean, and well-groomed”. Navy Haircut Regulations – Men Hair above the ears and around the neck must be tapered from the lower natural hairline upwards at least 3/4 inch and outward not greater than 3/4 inch. Hair on the back of the neck must not touch the collar.