On July 16, the U.S. Air Force released a request for proposals for the Ground Based Strategic Deterrent (GBSD), its next-generation intercontinental ballistic missile (ICBM). The GBSD is intended to replace the Minuteman III ICBMs currently in service. Under the solicitation, one prime contractor—either Boeing or Northrop Grumman—will produce the first 5 lots of the new ICBM. The USAF expects to award an engineering, manufacturing, and development contract in the fourth quarter in 2020.