The Trump administration’s recently called for the creation of a “Space Force” by 2020, but the independent military service dedicated to war fighting in space is likely several years away, according to retired Air Force Lt. Gen. David Deptula of the Mitchell Institute.

The Pentagon unveiled plans last week to establish several key components of the new Space Force, including a new combatant command for space, a new joint agency for satellite purchases, and a new warfighting community that incorporates space operators from across the services—none of which needs approval from Congress. The creation of a sixth military branch, however, first requires legislative action.