While the SOG Bowie or Recon Knife is the most well known of SOG knifes a lot of recon teams thought the knife wasn't the best in the field, so another very common knife was the Air Force's survival knife and knives from Randall and Gerber. These knives were most often attached to the web harness or STABO rig as can be seen here.
Aircrew Survival/Egress Knife (ASEK) used by U.S. Aviation aircrews. The US Air Force Survival Knife made by Camillus (and other manufactures during the war) has a 5" black phosphate coated high carbon blade with a sawtooth back. The knife has a unpolished leather handle and extra beefy hexagonal butt for use as emergency hammer. This knife comes with a leather sheath and sharpening stone that fits in a snap closing compartment on the sheath. With an electrically insulated handle.