What US Navy Carriers used during the evacuation of Vietnam?
The US generally kept one carrier at "Yankee Station" in the
Gulf of Tonkin, east of Da Nang and Hue, near the border between
North and South Vietnam. This was officially "Point Yankee". The US
kept at least one carrier in this vicinity from 1964 to 1973, to
carry out bombing raids in North Vietnam and close air support of
troops ashore.
There was a corresponding "Dixie Station" off the Mekong Delta
of South Vietnam, where the US kept an additional carrier in the
early years of the war.
Just about all the carriers in the US fleet were "on Yankee
Station" at some point during the war. The US had 22 carriers
during this era and all but the John F. Kennedy were in Task Force
77, of the US 7th Fleet on Yankee Station at one time or
another.
Currently the US has 11 of the 22 aircraft carriers in the
world. Eight other navies operate a total of 11.