i. When two Navy/Marine Corps aviation insignia are worn at a time, the senior insignia will be worn 1/8 inch above the other as follows (from top to bottom):
(1) Naval Aviator and Naval Aviation Pilot
(2) Naval Flight Officer
(3) Marine Aerial Navigator
(4) Naval Aviation Observer
(5) Combat Aircrew
(6) Naval Aircrew
However, a Marine qualified for both naval aircrew and combat aircrew insignia will wear only one of his choice.
j. When the Navy/Marine Corps parachutist insignia is worn, the basic parachutist insignia will not be worn. When aviation insignia is worn with the basic or Navy/Marine Corps parachutist insignia, the parachutist insignia will be centered 1/8 inch above any aviation insignia.
k. When EOD insignia is worn with aviation or parachutist insignia, the EOD insignia will be centered 1/8 inch above the other insignia.
l. When the SCUBA or other appropriate U.S. Navy diver insignia is worn with any other breast insignia, the diver insignia will be centered 1/8 inch above the other insignia.
m. Not more than two USMC-approved breast insignia will be worn on the left, and not more than one foreign pilot or other U.S. service pilot/navigator insignia will be worn on the right, at any time.