 He then served in the Philippine Islands and from 1940 to 1942, Nazzaro held assignments with the 7th Bombardment Group, Salt Lake City, Utah; 39th Bombardment Group, Geiger Field, Washington, and commanded the 302nd Bombardment Group, Tucson, Arizona.Early in 1943, Nazzaro was named commander of the 381st Bombardment Group, Pyote, Texas, and led the unit to England in May where it joined the Eighth Air Force.In January 1944, he became deputy director of operations, U.S. Strategic Air Forces in Europe.