"During the . . . crisis last fall it was decided to send the conventional carrier John F. Kennedy... to reinforce the Sixth Fleet in the eastern Mediterranean. She transited about 4,000 miles from Roosevelt Roads near Puerto Rico at a speed of advance of about 23 knots. This low speed of advance was necessary to conserve fuel so that a reasonable reserve would be aboard upon arrival. She refueled from the tanker . . . west of the Strait of Sicily.