On 1 April 1978, Puga was assigned to the 2nd Foreign Parachute Regiment 2e REP, where he was, in succession, section chief, assistant officer, and commander of a company in a unit combat capacity.

In August 1992, Puga rejoined the general staff headquarters at Paris at the corps of the study bureau and participated in the reorganization of the operational command of the armed forces.

On 1 July 2007, Puga assumed the functions of deputy chief (French: sous-chef) of operations at the general staff headquarters of the Armies and was elevated to the rank designation of général de corps d'armée.

On 16 January 2014, Puga, Chief of the Military Staff of the President of the Republic was maintained in the 1st section of officer generals of the French Army until 30 August 2015.

General Benoît Puga is targeted in 2024 by an investigation by the National Financial Prosecutor's Office for "corruption", "influence peddling" and "illegal taking of interests": he is suspected of having compromised with Senator Jean-Pierre Bansard.