The Dominion Starport is a terran structure available Mira Han and Matt Horner in Co-op Missions. It allows Matt Horner to call down his Dominion Fleet, with the support of Mira Han's tech lab. While normally the starport and attached tech lab can be swapped, Han has forcibly welded the two structures together.
Terran Units and Structures of StarCraft II
Units and Structures
Dominion Elite Guard