Inside the mess hall you can find the Boomer munitions manager's store at the north-west end of the hall way, You can find various explosive weapons such as mines, missle launchers etc, inside the store. Then near the west entrance you can find a door to some Boomer chefs inside a kitchen. At the middle of the hall you can find the tables and chairs, aswell as several Boomers eating. A couple of VR pods can be found at the southern part of the mess hall.
The Boomer munitions manager and the VR pods can be found here
Inside the Boomer munitions manager's store at the north west end of the hallway a mini nuke can be found in a box on the the top, right hand shelf at the back. The player needs to be hidden as the mini nuke needs to be stolen.
The star bottle caps can to be difficult to obtain if you have infamy with the Boomers, due to the fact there are 10-20 Boomers that can easily scatter these caps with their explosives.