I'm scratching my head about the "mass" comment as well. There are not enough SEALs to really mass anywhere. Have they experienced missteps and problems that exploded into a situation larger than the size of the original element that ran into trouble? Sure did, but their numbers employed on missions have always been relatively small.
Furthermore, they really don't need infantry competence for most of the missions they are assigned these days, at least not in a classical use of the word infantry.
Swimming, special recce, direct action, etc. can benefit from an infantry background, but it is by no means a prerequisite.
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