Surely there is some place else to get info other than the field manual.  The search on it is useless - try bunker or referral and nothing comes up.  Try to find out how to get troops out of bunker - wherever the bunker is - nothing.

Sir..We are here to help you...Ask and we will be happy to give you the best answer possible...However, things like "bunker" functions should have been covered by the "tutorial"..at any rate..Click on your bunker..youwill be able to tell what bldg is what if you hover with your mouse over the structure..the game will then tell you the name of that bldg..After you click on your bunker there will be 2 tabs..click on the one that shows what units you have in bunker and at the top will be 2 buttons.."recall"...to bring units out of bunker... and "secure"..to send units into bunker