Items to consider bringing:
Backpack to carry supplies and your lunch. We will be keeping breaks and lunch short in order to maximize game time, so if you carry all your gear and food with you, we can move on to the next mission much quicker.
Snacks or easy to eat food for lunch
Dump pouch to keep track of your empty mags
Facemask with mouth protection (no mesh wire for eyes, facemask must contain a lens). Sealed shooting glasses are acceptable for adults only. Minors must wear full facemask with mouth protection.
Mid-Cap or Standard mags. Hi Cap mags allowed, but discouraged unless you're using a heavy weapon like a SAW
Camelback or similar hydration carrier. Ideally, if you can get a larger hydration carrier that doubles as a backpack or you might just want to throw your bladder from your Camelback into your backpack so you're not trying to figure out how to carry both.
Plenty of water (at least 1 gallon, preferably 2 per person)
Red rag to let others know you've been hit
Hiking or combat boots
Gloves