Jean-Pierre Bosser was particularly renowned for becoming a paratrooper instructor, particularly at the 8th Parachute Regiment of the Troupes de marine, and participated to a dozen of exterior operations.

He also conducted simultaneously a technical military assistance mission for one year as a counselor of the para-commando battalion of Mauritania in 1985.

From 1990 to 1992, he occupied the post of chief of the operational center of the inter-arm general staff headquarters of the superior commandment of the New Caledonian Armed Forces (FANC).

Brevetted at the École de guerre in 1996, he served for five years at the bureau « études générales » of the Directorate of Military Personnel of the French Army (DPMAT) before assuming the command of the 8e RPIMa.

Then, from 2003 till 2005, he was designated as director of the student formations (DFE) of Écoles de Saint-Cyr Coëtquidan ESCC.