for use in aircraft where an oxygen mask is used exclusively. This helmet assembly is also an interim backup for the HGU-33/P when a form- fit liner cannot be fabricated. HGU-43/P HELMET ASSEMBLY. The HGU-43/P is a dual lens, form-fit helmet incorporating a neodymium laser protective lens for use in A-6 target range acquisition multisensory (TRAM) aircraft. HGU-44/P HELMET ASSEMBLY. The HGU-44/P is a dual lens, form-fit helmet used in aircraft where an oxygen mask is used exclusively. HGU-45/P HELMET ASSEMBLY. The HGU-45/P is a dual lens, form-fit helmet for use in OV-10A aircraft where an oxygen mask and boom microphone are both used. HGU-45A/P HELMET ASSEMBLY. The HGU-45A/P is a dual lens, form-fit helmet incorporating a neodymium laser protective lens for use in the OV-10D aircraft where an oxygen mask and boom microphone are both used. HGU-46/P HELMET ASSEMBLY. The HGU-46/P is a form-fit helmet incorporating the VTAS (Visual Target Acquisition System) visor assembly for use in the F-4 VTAS aircraft. HGU-47(V)l/P HELMET ASSEMBLY. The HGU-47(V)l/P is a single lens, pad-fit helmet required in aircraft where a boom microphone is used or where a boom microphone and oxygen mask are used interchangeably. HGU-47(V)2/P HELMET ASSEMBLY. The HGU-47(V)2/P is a single lens, pad-fit helmet incorporating a boom microphone without amplifier and the CX-13155/A communication cable for use in C-1A and C-2A aircraft. HGU-47(V)3/P HELMET ASSEMBLY. The HGU-47(V)3/P is a single lens, pad-fit helmet incorporating a boom microphone without amplifier and the CX-13164/A communication cable for use in T-34 aircraft. HGU-47(V)4/P HELMET ASSEMBLY. The HGU-47(V)4/P is a single lens, pad-fit helmet incorporating a boom microphone without amplifier and the CX-4832A/AR communication cable for use in P-3 aircraft. HGU-49/P HELMET ASSEMBLY. The HGU-49/P is a single lens, form-fit hel- met incorporating a boom microphone and CX-13128/A communication cable for use in S-3A aircraft. HGU-50/P HELMET ASSEMBLY. The HGU-50/P is a single lens, form-fit helmet incorporating a binaural headset required for use in the aft stations of the EA-3B aircraft. HGU-52(V)1/P HELMET ASSEMBLY. The HGU-52/P is a single lens, form-fit helmet incorporating a boom microphone and CX-13155/A communication cable for use in A-3 aircraft. HGU-52(V)2/P HELMET ASSEMBLY. The HGU-52(V)2/P is a dual lens, form-fit helmet incorporating a boom microphone and CX-13155/A communication cable for use in E-2 aircraft. MAJOR HELMET COMPONENTS The following helmet components are avail- able to achieve the desired configuration for the aircrew member helmet. PRK-37/P HELMET SHELL ASSEMBLY. The PRK-37/P helmet shell assembly is intended to protect the head during in-flight buffeting and emergency situations such as ejection, bailout, or crash landings. It resists projectile penetration and distributes impact forces over the entire head. The helmet shell is the platform for other components such as the visor assembly, communication devices, and the oxygen mask. PRU-39/P HELMET SHELL LINER AS- SEMBLY. The PRU-39/P is a helmet shell liner that is a form-fit, foam-in place type assem- bly, which is installed in the PRK-37/P helmet shell assembly. The PRU-39/P consists of a rigid polyurethane foam liner molded to fit the avia- tor’s head. The KMU-439/P (liner mold kit) is positioned on the pilot’s head, and foam chemicals are injected into it. The liner is finished with a soft urethane foam comfort pad and leather covering. When properly fitted, the liner provides impact energy absorption, helmet stability, and comfort. PRU-39A/P HELMET SHELL LINER ASSEMBLY. The PRU-39A/P is a helmet shell 4-20