Today in World War II History—Sept. 4, 1942 POSTED: Monday, September 4, 2017 by Sarah Sundin US Army rank insignia for technician third class, WWII 75 Years Ago—Sept. 4, 1942: US Marines secure Savo Island off Guadalcanal. US Army adds “T” to chevrons for technician third, fourth, and fifth class. Movie premiere of Orchestra Wives, starring Glenn Miller and his orchestra.