I'm a little confused are you guys saying the F4 are the ones that came in the first helicopter, if so then it should be F5 I think they were suppose to go in pairs to do their missions on the island, but since they had problems coming to the island some had to bail out except for the pilot. So since John threw the knife into the back of one of them that put her out of comission but not before she was able to get a messages back to the freighter.
I think their all working for Widmore but were only told so much information, they were picked to do certain things because of their abilities brains/muscles.
I caught a glimps of one of the guys shooting those automatic rifles on the freghter, I thought his tattoo was somewhat like Jack's could he had been a part of Jack's past when Jack had gotten his tattoos from that woman many many moons ago? I thought we were going to get to know more about those tattoos of Jack's.
Sorry if I'm off topic here.

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Standing in the ocean with the sun burning low in the west
Like a fire in the cavernous darkness at the heart of the beast
With my beliefs and possessions, stopped at the frontier in my chest
At the edge of my country, my back to the sea, looking east