Flintlock:
You're refering to the War in the Pacific National Historical Park at Asan, Guam. It's right on Asan point, where on July 21, 1944, elements of the 3rd Marines started the liberation of the first US soil taken by the Japanese.
http://www.nps.gov/wapa/index.htm
http://www.airdaleamericanhistory.co...sanBeach1.html