In 1928 Fleming was appointed Adjutant General of the Louisiana National Guard with the rank of
brigadier general. He continued to serve in this position until 1948. Seen as an ally of the political organization run by
Senator Huey Long and
Governor O.K. Allen, in 1934 Fleming deployed National Guardsmen to the offices of election officials in
New Orleans when Allen declared martial law during a disputed election between the Long-Allen group and a group headed by
Mayor T. Semmes Walmsley. In response, Walmsley deployed hundreds of New Orleans police officers. Fleming was charged with
contempt of court for refusing a judge's order to dismiss the troops. The dispute was resolved when the National Guard vacated the election offices (while remaining in New Orleans) and the police stood down, and the election proceeded as planned. When Long was assassinated in 1935, Fleming commanded the honor guard for his funeral. From 1940 to 1946 Fleming also commanded the 55th Cavalry Brigade, a unit of the
23rd Cavalry Division. From 1940 to 1947 Fleming also concurrently served during
World War II as the federal Director of
Selective Service for Louisiana. ==Post World War II==