UNIFORM ITEMS AND REGULATIONS FOR THEIR WEAR
2. Neckties (Male)
a. Marines will wear a 3-1/8 inch khaki necktie of any approved cloth with the service "A"/"B" and blue dress "C" uniforms. It will not be worn with the crew-neck service sweater. Neckties may be tied with any type of standard necktie knot which presents a neat military appearance.
How to tie a Double Windsor
Tuck the wide end down through the front loop of the knot.
Pull down gently on the wide end from below the knot until the knot is tight.
