The Fall of Saigon Marine Association website is packed with first-person accounts from the Marines stationed at the American Embassy in Saigon on April 29-30, 1975, during Operation Frequent Wind.
These are interesting tales from the men who were there, including the last Marine in Saigon, MSGT John Valdez. His account is straight-forward, but with no radio contact and it having been hours since the last helicopter arrival, they had resigned themselves to the same fate of the defenders of the Alamo.
The Marines of Frequent Wind behaved bravely in a very bad situation. Good job, guys.