On foreign missions from 1920 to 1925, Flouret participated in aviation operations in Austria and Hungary.

He then became a professor at the War College at the Center of Advanced Military Studies in Warsaw, Poland.

After entering the War College in March 1925, he then transferred to the Ministry of Finance as Deputy Chief of Staff for Joseph Caillaux on April 18, 1925, and left the army in November 1925.

[1] He was a French Resistance member, operating under the name Fevrier – February, when he took City Hall of Paris on August 20, 1944.

Flouret performed the duties of Prefect of the Seine Department from September 2, 1944, with Edgar Pisani, future minister of General de Gaulle, as the director of his cabinet.