In 1920, Ofstie reported to
Naval Air Station Pensacola,
Florida for Navy Pre-Flight School. Upon completion, he attended Naval Flight Training school which he completed in 1921 and was designated a
Naval Flight Officer. His first air squadron was Fighter Squadron
VF-1 "Wolfpack" where he served from 1922 to 1924. With other Navy pilots in the 1920s, Ofstie participated in annual flight competitions with Army pilots in the Curtiss Marine aircraft. In 1924-1925, he was assigned as Commanding Officer of Scouting Squadron
VS-6. From 1927 to 1929 he served as Aviation Officer of the
light cruiser . From 1929 to 1933 Ofstie served in the Flight Test Division at
Naval Air Station Anacostia. Returning to sea aboard the carrier in 1933, Ofstie took command of Fighter Squadron
VF-6 for the next two years. Promoted to Lieutenant Commander he was assigned as Assistant Naval Attaché in Tokyo, Japan, and upon completion of that duty he returned to sea as Navigator on the carrier . As an interim assignment, he served on staff duty aboard the carrier USS
Saratoga in 1939 before returning to the
Enterprise. Before the United States entered
World War II, Ofstie served on staff duty on the carrier in 1940. With the war in Europe already underway, he next served as Assistant Naval Attaché in
London,
England. ==World War II==