Keystone Light is heading into the summer selling season with a new partner: the USO. As part of its Americana packaging launching this month, the light beer will include the USO logo on 15-packs, 24-packs and 30-packs in an effort to help raise awareness for the military charity, which has more than 230 locations in 31 states and 15 countries to support service members and military families around the world.