Well, there's some base force units (that aren't tagged BF) that are equivalent to Cub and Lion advanced Naval bases.
And then there are the USN "Special" Naval Construction Bns. Not really classical Seabees, but rather Seabee stevedores whose job was to conduct Shore Party and port improvement operations on island bases.
And then there's the USMC AmphTrac Bns, which were not tanks, but rather PhibSup transports. Those specific devices (LVT-1s) are also Shore Party enabled, so they work just like LCVPs in assisting load/unload of non "A" ships in harbor, without the need for LCVP TFs. Army AmphTracs, too. Worth a poopload more as Shore Party than as tanks.
Probably a couple more that I can't remember offhand, but the whole idea is to limit the availability of NavSup to a very few units such that only specifically populated bases, with specifically defined units, can operate as Naval bases with repair and rearm capability. Everything else is a "base with boats", or a unit with "handy hands". It's an operational concept kinda thing.