Purple Haze Soldiers maneuver using a smoke grenade to conceal movement during a simulated urban assault in Operation Blue Dawn in Ełk, Poland, Feb. 18, 2026. U.S. forces in Europe conduct routine training in Poland to enhance interoperability with NATO allies and maintain readiness along the alliance's eastern flank. SHARE: Download: Full Size (1.03 MB) Tags: nato, partnerships, army, training, operation blue dawn Credit: Army Sgt. Eric Allen VIRIN: 260218-Z-BN475-1399M.JPG Photo Gallery