Located halfway between Hawaii and the Philippine Islands, the island of Guam was of great strategic interest to the U.S. Navy. Long before World War II, it was a communications relay post and coal depot for the Navy. The eight graduates of “On-The-Roof Gang” Class #1 were sent to Guam in early 1929, where, under the leadership and guidance of self-taught On-The-Roof Gang operator, CRM Malcolm “Felix” Lyon, they established the Navy's second intercept site, Station BAKER. The original intercept site in Guam was set up in a building called the “Old Spanish Guard House,” in Agana. The original site was barely habitable and was moved to an abandoned hospital on San Ramon Hill in 1933. In 1934, the site moved for the last time, this time to the abandoned radio station at Libugon Hill. At Libugon, On-The-Roof Gang intercept operators proved the strategic value of Radio Intelligence through the monitoring of Japanese naval communications, especially during the Orange Grand Maneuvers of 1930 and 1933. Guam was overrun by the Japanese on December 8, 1941, and the seven On-The-Roof Gang operators fled to the hills before being captured by the Japanese and held at Zentsuji POW camp near Hiroshima. Their heroics before capture ensured the Japanese remained unaware of their operation even though they occupied Guam well into 1944. While in POW camp, each of the Roofers contributed to the war effort by sabotaging Japanese war material and by keeping each other alive.