The United States Army eventually adopted their own version of the jungle hammock, complete with rain proof fly and sandfly netting for use by U.S. and Allied forces in tropical jungle regions such as Burma during World War II. While at first reluctant to accept the idea of its men sleeping in hammocks, the United States Marine Corps later employed jungle hammocks in New Britain and later Pacific island campaigns where heavy rain and insects were prevalent; concerns over injuries from machine gun and artillery fire were overcome by first digging a slit trench, then staking the hammock's support lines to suspend the hammock beneath ground level.
Later U.S. Army hammocks issued during the Vietnam conflict, such as the M1966 Jungle Hammock, were mistakenly fitted with waterproof bottom panels, which often became filled with water overnight. On the other side, North Vietnamese Army (NVA) and Viet Cong (VC) forces regularly employed jungle hammocks fabricated from scavenged or captured US parachute cloth and shroud lines. Hung well off jungle trails, the hammocks kept down the incidence of disease and illness, which NVA commanders generally regarded as a greater threat than shrapnel injuries caused by sleeping above ground.