Brazilian Air Force 3rd Sgt. Romulo Carvalho, center right, jumps for the football during a game at Natal Air Base in Natal, Brazil, Nov. 6, 2013, during a break in training during exercise CRUZEX 2013. CRUZEX is a Brazilian-led air-to-air, aerial refueling and command-and-control training exercise focused on building interoperability between several partner nation air forces.