I can see the argument on both sides, although I would be surprised if the "military get first refusal" point is valid.
Perhaps someone can comment from a position of knowledge, but surely in the case of 2 incidents at the same time, allocation of SAR cabs would be decided on the balance of need (much like medical support) rather than 'military outrank civvies'.
Thus in practical terms, would it matter any difference to the ejectee bobbing up and down in his dingy?