Observer, Coach/ Trainer assigned to 188th Infantry Brigade instructs Soldier assigned to 4th Platoon, 376th Postal Company, 304th Sustainment Brigade on zeroing his M4 during Mobilization Exercise II (MOBEX II), Jul. 24, 2023, at Fort Stewart, Georgia. The MOBEX was part of 1st Army's Pershing Strike Exercise which validates Mobilization Force Generalization Installations (MFGI) operational and support plans, Soldier readiness processing, and validation of a Global Force Management Allocation Plan (GFMAP).