From: Iowan in MD/DC
ORIGINAL: General Patton
I read some where that the range limit is one hex. But only if the other side doesn't have a unit one hex away on the other side of that base.
Playing the Guadalcanal scenario, I've had the islands immediately north, northwest, and west of Tassafaronga be occupied by the Allies while I've still had troops at Tassafaronga. Lots of troops, even. Once I had the upper hand, they switched back to me...I expect them to keep switching back and forth depending on who has the most land power in the vicinity.
I would recommend taking all of those that can be built to reasonable sizes. You can ignore any that have an SBS of 0-1, IMHO. Others (that can conceivably be built to port, and more important airfield, size 5+) I would take. Not immediately, but as soon as you can.
For taking them, I find paradrops of AF Coys, Nav Gd fragments, or INFp units to be very handy. Use flying boats and you'll be able to pick them right back up the very next turn. You can base some flying boats out of Davao, Balikpapan, and/or Tarakan along with 1-2 SNLF or raiding regiments and take a whole lot of them over the course of a handful of days. Very handy for backfilling.