Did the American and British Governments intend to permanently dispossess the Ilois? - If they did why the opt out in 2016 and why put an end date to the agreement for 2036. The American and British Governments had done similar deals in the past - those were connected to the lending of fifty old first world war destroyers during the Second World War.

Did the Americans acting on the request of Grenada's neighbours intervene to permanently occupy the island of Grenada? No they did not.

What was the intention of the Argentines invasion of the Falkland Isles? To permanently occupy the Islands.

No comparison at all.

By the bye, when RN ships of the "Yellowbird" Squadron deploy they normally fall under the operational control of either a US Navy Admiral or US Coast Guard out of Key West and Fort Lauderdale respectively depending upon tasks and station. So it is not surprising that the confederation of Island States that Grenada belonged to turned to the US for assistance in something that seriously troubled them. We actually did send a Task Force to "invade" Anguilla in 1968, but that was to save it from being taken over by US organised crime syndicates.