The Pentagon has spent months positioning the troops and weapons needed for the U.S. to launch a military attack on Cuba — all it needs is a final go-ahead from Donald Trump.

The president has floated an invasion of the island after economic and political pressure failed to topple the Communist government. But the Navy’s built-up presence in the region — the largest in the world outside the Middle East — would allow the U.S. to act immediately.

These strategically placed assets set the table for military action, from a capture of Havana’s leadership much like the seizure of former Venezuelan President Nicolas Maduro, to a series of precision strikes. And they open the possibility that the U.S. throws itself into the third international conflict of the Trump administration.

Cuba is “in a lot of trouble,” Secretary of State Marco Rubio said Wednesday at a full Cabinet meeting. “Having a failed state 90 miles from our shores is a threat to the national security of the United States.”

The armada in the region is slightly smaller than it was in January when the U.S. captured Maduro. But the USS Nimitz aircraft carrier strike group entered the Caribbean in May, along with several guided missile destroyers and cruisers that can launch precision missiles at targets onshore. An array of advanced American drones and surveillance aircraft have also circled Cuba for months, according to flight tracking sites. The USS Kearsarge amphibious ships and escorts, which carry 2,500 Marines, are off the coast of Virginia preparing for a new deployment, and could replace some ships heading home.

The surge provides a variety of military options, although the Pentagon would need additional troops for a massive ground invasion.

The Nimitz arrived in the region on the same day as the U.S. indicted former president Raul Castro, in what appeared a public show of force. “The Nimitz is likely there primarily for intimidation, though it could be used in a military operation if needed,” said Mark Cancian, a former Pentagon official and now a senior analyst at the Center for Strategic and International Studies.

The ship, along with fighter planes based in Florida and Puerto Rico, would probably play a role in any military action in Cuba, he said. “Air strikes are possible to take out their air defenses to allow broader air operations or, perhaps, destroy their leadership with the idea of establishing a relationship as we have with Venezuela. Raul Castro would be their first target.”

But the administration faces a timeline to act. Many of the biggest warships deployed in the summer are approaching 10 months at sea, far beyond the usual six to seven months. This has caused defense officials to worry about overextending crews, and adds to the stress on a naval force that is also conducting a blockade of Iranian ships in the Arabian Gulf.

The White House referred questions to the Pentagon. The Navy declined to comment on current deployments. Naval Forces Southern Command did not respond to a request for comment.

“These back-to-back long deployments will add up over time,” said a defense official, granted anonymity to speak candidly about military operations. “Keeping them out there so long creates more problems in the long run when it comes to refitting and repairing those ships once they come home.”

The prolonged missions come on the back of the record-setting 11 month deployment of the USS Gerald R. Ford aircraft carrier, which ended this month after sailing from Europe to the Caribbean for the Maduro operation and then to the Middle East for the Iran war.

The Nimitz is also extended on what was expected to be its final deployment of a 50-year career. It was initially set to sail to Norfolk, Virginia, to have its nuclear-powered engines removed, but the Navy has decided to extend its life until 2027.

The USS Iwo Jima and USS Fort Lauderdale amphibious ships have also remained since the summer, although the Marine Corps announced Wednesday that they will return to Norfolk next week.

But the long deployments take a toll on the crews and Marines, who had planned for a normal rotation and are now months past their initial scheduled return home.

“You don’t sign up for an easy time, you know any deployment is going to be uncertain,” said Joe Plenzler, a retired Marine Corps officer. “But extending deployments like this, when it feels really open-ended, that starts to bleed into retention. How much more likely am I able to convince my family to do another enlistment and stick with it?”