Dee ihe na-aga n'ihu maka paragraf a - Na mbido 1942, Schrier sonyeere ndị agha mmiri nke abụọ na Camp Elliott, San Diego, ka a na-akwalite ya na platoon sergeant na Eprel 1942. Na June 1942, ọ bụ akụkụ nke ụlọ ọrụ abụọ nke 2nd Raider Battalion nke e zigara na Midway Island
iji wusie ndị agha ebe ahụ ike. O sonyere n'agha nke Guadalcanal ma hụ onwe ya na-ekere òkè na 2nd Marine Raider Battalion's epic "Long Patrol" n'azụ ndị iro site na November ruo December 1942. N'oge a, ọ pụtara ìhè site n'idu ụfọdụ n'ime ndị otu ya a chụpụrụ n'ebe dị nchebe mgbe onye isi ndị otu ya dubara ha n'ọnọdụ ọjọọ. Ná mmalite afọ 1943, e buliri ya n'ọkwá lieutenant nke abụọ. Mgbe nke ahụ gasịrị, e kenyere ya ọrụ ndị ọzọ n'ime nzukọ Raider, dị ka nleba anya na nyocha na agwaetiti ndị iro na-ejide tupu ndị agha buru ibu emee mwakpo mwakpo. E nyere ya Legion nke Merit maka ọrụ ya na Vangunu Island n'oge Mgbasa Ozi New Georgia na June 1943. Ọ rụkwara ọrụ na Bougainville iji kwado ọrụ ndị agha ebe ahụ. Na Febụwarị 1944, mgbe a gbasasịrị ndị Marine Raiders, ọ laghachiri United States ịghọ onye nkuzi ndị agha na Marine Corps Base Camp Pendleton. E kenyere ya ọzọ ka ọ bụrụ onye isi ndị ọrụ nke E Company, 2nd Battalion, 28th Marine Regiment, 5th Marine Division. N'ọnwa Septemba, ndị 5th Division hapụrụ Camp Pendleton gaa Hawaii, maka ọzụzụ ọzọ. Na Jenụwarị 1945, Ngalaba nke 5 hapụrụ Hawaii maka mwakpo na ijide Iwo Jima.