SCHOFIELD BARRACKS, HI, UNITED STATES12.16.2018 - U.S. Army AH-64 Apache helicopter, assigned to 25th Combat Aviation Brigade, 25th Infantry Division, flies in formation during a Division Run during Tropic Lightning Week on Schofield Barracks, Hawaii, December 17, 2018. The 25th Infantry Division is celebrating its 77th birthday with their annual Tropic Lightning Week. The Division was formed October 1, 1941 at Schofield Barracks and saw combat during the Japanese attack across Oahu on December 7, 1941. Tropic Lightning Division is celebrating their birthday in December due to a robust training schedule in October. There will be competitions between the battalions to earn the coveted Guadalcanal Cup. 2nd Battalion, 11th Field Artillery Regiment has won the cup the last three Tropic Lightning Weeks. The birthday celebration will end on Friday, December 21 with a Division Pass and Review at historic Weyand Field. (U.S. Army photo by 1st Lt. Ryan DeBooy)