The military base is listed as "Lago Zancudo" on this nice satellite view depiction of GTA 5's map ... Unlike in singleplayer, the ground checkpoints are never open, so you'll need to either ...

Vice President JD Vance and Usha Vance will visit the US military's base in Greenland on Friday. Pituffik Space Base was established in 1951 as part of a defense treaty between the US and Denmark.

In fact, the U.S. already has a presence there: Pituffik Space Base, an American military installation that Vance will visit on his trip. The remote base situated between the U.S. and Russia is ...