I can't find it.... could you be more precise?
The only swearing I can find (which is allowed by all networks in the US and in the UK) is at 26:19 "You want me, you bastard? Well I'm here."
If you give us an actual time (or quote from the lines before/after) then we can find it ourselves and comment properly. I can't find uttered by Amis that sounds like the F word. The nearest is "I feel it"
I'd be surprised if it is there - J. Michael Straczynski used "frag" instead of the F-Word in his scripts.