DENVER -- The Air Force Research Lab's Vanguard program could begin testing this year to prove out whether the service can rapidly deliver military cargo to various points around the globe using rockets. The Air Force this week posted a notice that it will conduct an environmental assessment at Johnston Atoll -- a U.S. territory about 717 nautical miles southwest of Honolulu, HI used for military purposes -- to build and operate two landing pads in support of Rocket Cargo...