I believe it may stem from the belief that one portion of the service is stepping on someone else's "turf." Unfortunately there are some in SF who feel that the tactic of "lurking" is their purview alone, just as there are conventional infantry folk who feel "lurking" is beneath them.
Plus there might be a protectionist aspect to it all. If the average GI was suddenly able to do all those things SF tout they solely do then SF wouldn't be so "special."
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