Ah man you'll like this. If you can get any info from
PR at the base find out:
Is it outdoors(usually)?
Will it take place on the parade deck(usually)?
What areas will you be limited to(lens consideration).
The time will be an issue for the angle of the sun...so be prepared with a flash for they will be wearing a cover(hat) that will shadow the eyes.
If possible try to position yourself to get some shots of the passing in parade of the troops and then position yourself to get some shots of the transfer of the base/battalion colors(flags). The retiring commander will be handing these over to the incoming commander. Look for those moments of saluting(cool).
This is it in a nutshell...the basics...the rest, just wing it...there will be plenty of shots to get; and this is based on how it is done in the Marine Corps....not sure about the Air Force way but should be along the same lines of military protocol.