From: Near Portland, OR
It's not in the manual. It was added fairly recently.
If you're version supports it, when you look on the screen with all the game data like ships sunk, victory points, etc. Look for a button that says Destroyed Land Units, or something like that (I don't have the game running, so I don't remember exactly). Click on that and you will see a list of destroyed LCUs. The ones in yellow can be brought back, the gray ones can't. Click on a yellow one to view it, then go back to the destroyed LCU list. The unit you just viewed is now at the bottom of the list and has the PP required to bring it back. Right click on it and you will get a message saying it will return in x to y number of days and the location.
It's a bit complicated, but once you learn the drill it isn't that tough.
BTW, there are a number of features that happen when you right click on a link. This is the only one that only happens if you right click. All the others can be done some other way, though the right click is more convenient.
WitP AE - Test team lead, programmer