The United States Naval Academy graduate, he spent his career mostly in Quartermaster Department and completed his service as commanding general, Marine Supply Center Barstow.

He attended the high school in Chester, Vermont, and subsequently received appointment to the United States Naval Academy at Annapolis, Maryland, in July 1918.

Many of his classmates became general officers later: Hyman G. Rickover, Robert E. Blick Jr., Herbert S. Duckworth, Clayton C. Jerome, James P. Riseley, James A. Stuart, Frank Peak Akers, Sherman Clark, Raymond P. Coffman, Delbert S. Cornwell, Frederick J. Eckhoff, Hugh H. Goodwin, John Higgins, Vernon Huber, Michael J. Malanaphy, William S. Parsons, Albert K. Morehouse, Harold F. Pullen, Harold R. Stevens, John P. Whitney, Lyman G. Miller and George J.

[1] Upon his return stateside, DeWitt assumed duty as detachment commander of the Marine barracks at Naval Submarine Base New London, Connecticut.

[1] DeWitt was appointed commander of the Marine detachment aboard the cruiser USS Denver in May 1928 and served ashore on the East Coast of Nicaragua expeditionary duty during the restoration of order during a period of rebel uprisings.

Upon the graduation in December of that year, he was promoted to lieutenant colonel and appointed officer in charge of War Plans and Statistical Division, Quartermaster Department, Headquarters Marine Corps.

He was later reassigned at Pearl Harbor to become officer in charge of Planning Division, Supply Service, Fleet Marine Force, Pacific under Lieutenant General Holland Smith.

[3] DeWitt retired from the Marine Corps on August 1, 1958, after almost 30 years of service and settled in Alameda County, California, and worked as secretary for Pacific State Mortgage Company.