Sgt. Derek Czerniak crawls under a barbed wire obstacle during Demon Fury. U.S. Army Sgt. Derek Czerniak crawls under a barbed wire obstacle during Demon Fury, a competition designed to test the full spectrum of soldiers' combat skills on Camp Taji, Iraq, on Nov. 7, 2010. Czerniak is assigned to the 1st Infantry Division's Enhanced Combat Aviation Brigade. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 237390-D-LMC97-058.jpg Photo Gallery