"Pilots, Man Your Planes!"   
                                         WWII U.S. Naval Aviation Collector's Guide                                                                              
U.S. Navy A-14 Oxygen Masks
Reproduced here at 100% of original size, these pages are from the instruction sheet included with the late production Navy marked A-14. Note the airman is wearing an AN-6542 flgiht helmet with Navy earphones and an M-422a intermediate jacket. Rather than using the stud fastener web strips provided in the kit, directions are provided for installing the studs through the helmet material itself.