Design & Development of a Use-of-Force Training Helmet to protect users against repeated impacts and Blunt-Trauma. A rigid shell is covered by foam for an optimal protection of the defender’s skull, and of the attacker’s limbs. The rigid faceguard is covered by foam and wrapped in a ventilated mesh to enhance breathability. A curved visor protects the eyes and assures a good visibility, a large field of view and minimizes fogging. An adjustable retention system stabilizes the helmet during movements and impacts. High mobility of the head with no restraints on lateral and front-back movements. An comfortable inner padding is interchangeable for different head sizes.