United States Air Force uniform regulations call for the wear of a blue herringbone twill tie with the Men’s Service Dress and Semi-Formal Dess uniforms, as well as with the long-sleeved blue shirt (i.e., Men’s Service Uniform, Class B). Tie tabs are worn by females in place of ties on these uniforms/blouses.
Regulations do not specify a particular knot for the tie, but they do state that the bottom of the tie must cover some part of the buckle without extending below its bottom. Tie tacs are authorized for wear with the tie, but only if they carry the “wing and star” design (“Hap Arnold wings”), the Air Force symbol (the futuristic, angular version of the “wing and star” that the Air Force tested for nearly four years before trademarking it in 2004), or insignia of rank. Tie tacs/clasps are centered between the bottom edge of the knot and the tie tip’s bottom.