THRACIAN SPRING Alaskan Guard members load a C-130 Hercules with cargo headed to Bulgaria in support of the phase 1 operational readiness exercise Thracian Spring, March 22, 2007, at Ramstein Air Base, Germany. The joint exercise with the Bulgarian air forces trains on NATO transport aviation procedures. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 174716-R-IYZ99-645.jpg Photo Gallery