also called Underway Replenishment.
an amateur silent piece of film showing some of the RAS proceedure.

the info that comes with the film is of interest so is repo'd here;

Great video, it took me back in time. However, the date of filming c1955, was suspect. Therefore I ran the date past my ex-shipmates on the CV39THECHAMP WEB site the following is our conclusion.

This video was definitely taken during the Korean cruise and it was taken during the return trip from Yokosuka to Mayport sometime between late October 1953 and early December 1953 when the Champ returned to Mayport.

Time frame clues:

A code of 'F' is visible on the tail of a F2H2 Banshee aircraft indicating that it belonged to Carrier Air Group-4 (CVG-4) CVG-4 was deployed on the Lake Champlain during the Korean War cruise (Apr 26 1953 - Dec.4 1953 (Med Indian Ocean Korean War)

The presence of bow 3 50 guns and fire control director which were removed after the Korean War cruise.

F4U Corsairs are visible on the flight deck. F4U Corsairs squadrons were not deployed on the Lake Champlain after the Korean War cruise.

Former Lake Champlain sailor
Mike

and,

This is a classic film of refueling at sea. I was a SM aboard a reefer and I participated in many a event like this. The Oiler is the USS Pawcatuck (AO-108). She was assigned to the 6th Fleet which means this footage was probably shot in the Med. The timeframe of 1955 or so is probably correct since those are Panther jets on deck along with what appear to be A3D's (prop jobs).

As the ship approaches you see the Romeo flag being flown which means prepared to be received. The other flags are the Bravo flags which is a Danger flag flown when loading fuel or ammo. The two black diamonds are flown when two ships are underway and not able to manuvuer on their own. They have the right of way at sea. The other hoist shows that a flag officer is aboard and who the command vessel is in this case most likely the Carrier.

For those who never participated in something this it's hard to imagine what it's like. The Oiler was later converted to a Jumbo and I may have some stills of her from my own Med cruises after conversion.