Looking at Eight LRS Alternatives:

According to the Congressional Budget Office, the Pentagon is behind in defining specific requirements for a new Long Range Strike platform, but it has speculated about eight “classes” of long-range weapons that might fill the bill. The eight include aircraft, long-range missiles, and space-based weapons, states the CBO in a new 60-page report that examines how well each would perform and the costs to develop them. Under the heading “arsenal aircraft,” we find the C-17 armed with a supersonic, long-range missile. There are also medium- and long-range subsonic and supersonic bombers and surface-based and space-based unmanned vehicles. One of the more obvious conclusions: The C-17 as an arsenal aircraft would be lower cost than a new bomber but very vulnerable to enemy air defenses.