As commander of UDT 5, he participated in the invasion of Saipan, and received a second Navy Cross for leading his team in a daylight reconnaissance of fortified enemy beaches under heavy fire, and on 10 July 1944, leading a night reconnaissance of heavily defended beaches at Tinian island.
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His wartime service also included participation in the invasions of Saipan, Tinian, Iwo Jima, and Okinawa.
He represents the second senatorial district of Tinian & Aguiguan and is a member of the CNMI Covenant Party.
After graduation, he joined the Army and served on Tinian, an island in the pacific, where he located and detonated abandoned ammunition.
The mission, as revealed by the grim Chief of Staff Asakura (Shinichi Tsutsumi) following the Atomic bombings of Hiroshima and Nagasaki, is to intercept U.S. ships transporting a third nuclear weapon to Tinian Island, the principal base from which American B-29s are striking the Japanese home Islands.
Initial efforts to settle the island met with difficulties,including an infestation of scale insects, followed by a severe drought in 1919.
While overseas, Corporal Terwilliger participated in the invasions of Tinian and Iwo Jima, and had his tank knocked out at Saipan.
In late April 1945, Colonel Tibbets declared the group combat ready and the ground echelon moved to its new home, North Field, Tinian, in the Marianas, on 29 May with the air echelon following on 11 June.
Following months of delays, the squadron arrived in the Pacific Theater, being assigned to Ie Shima in the Ryukyu Islands on 28 June 1945 from Saipan/Tinian.
Following months of delays, the 507th arrived in the Pacific Theater, being assigned to Ie Shima in the Ryukyu Islands on 28 June 1945 from Saipan/Tinian.
As a member of the 3rd Battalion, 23rd Marines, 4th Marine Division, he was sent overseas in December 1943, and participated in the campaigns for Tinian, Marianas Islands, Marshall Islands, and Iwo Jima.
As an assault amphibian vehicle crewman, he landed in the first waves on D-Day at Tarawa, Saipan, where he was wounded, and Tinian.
In July 1944, U. S. Marines invaded the Mariana Islands and as soon as West Field, Tinian, was readied in May 1945, the group flew to West Field and continued the Air Offensive against Japan.
The airfield was named after Lt. Wayne F. Kobler, a 19th Fighter Squadron pilot who was killed on 27 June 1944 while flying his P-47 on a low-level attack mission on Tinian.
While on Tinian it was used on 13 training and practice missions and five combat missions to drop pumpkin bombs on industrial targets on Toyama, Ōgaki, Shimoda, Yokkaichi, and Nagoya.
Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Tinian International Airport is assigned TNI by the FAA and TIQ by the IATA (which assigned TNI to Satna, India).
While at Tinian, Marquadt and crew B-10 flew Up An' Atom on eight training and practice bombing missions and pumpkin bomb missions against industrial targets in Taira and Hamamatsu, Japan.