From: Eastern US
HB is exactly correct. Your "little friends" are the USN Port Svc Det -- US Navy Port Service Detachments, which are easy to amphibiously unload onto dot bases, and have enough naval support to ease the unloading of larger devices. The PSDs also include a little aviation support.
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Another question I can't find in the manual.
I have a base force and was trying to unload it at Luganville. Everything is unloaded...except for a radar sub-unit. It says it can't be unloaded there - I assume it's a port size issue? How big of a port do I need?
Alberts answer is good but a bit vague. Amphib TFs are best for unloading anything, even supply, at a size 1 or smaller port. Even large guns like 155s will unload over the beaches from an amphib TF, although I believe the radar will not. The radar should unload once the port reaches level 2, IIRC. The addition of naval support increases the unloading capacity of any size port, the more nav support the better. The US has several very small dedicated nav support units (can't recall the exact names right now but they are identified by letter codes...A, B, C, D, E). These are invaluable units for unloading at level 0 or 1 ports to get your operations going there. Try to plan the inclusion of these for any operations aimed at dot bases or level 0 or 1 ports.
Nav support also increases the rearming capability of ports. There is a table in the manual (188.8.131.52)that shows the port size and port size + min nav support necessary to rearm various size armaments. You need a min size 4 port for 5" guns, min size 5 port to rearm 6" guns and a min size 6 port to rearm 8" guns. Nav support lowers the port size requirement for these.
WitP-AE -- US LCU & AI Stuff
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