You have an impressive, well thought-out kit. I really like the layered approach.

You asked about what else might be added to your equipment, other than radio equipment. You might consider the following:

You might want to add some tweezers and a fresnel lens to the minikits and/or first aid kit. Do you have room to cram in a couple of activated charcoal capsules and pepto-bismol tablets?

If the minikit is not waterproof, you might want to consider putting the tin in a ziplock bag.

In the backpack, you might want to add the following:
* pepper spray (for the 2- and 4-legged varmints) (If you have a choice, opt for the solid stream versus the spray or fog.)
* backup method of firestarting
* cornstarch in small shaker (to keep feet and crotch dry)
* insect repellent (Consumer Reports recently had a good article on insect repellents, and rated several)
* velcro straps
* spare eyeglasses with case, if you wear glasses.
* spare sunglasses with case, even if they are the roll-up type
* a few feet of survey flagging
* small bottle of gorilla glue in a ziplock bag
* at least one change of pants and shirt
* at least 1 or 2 additional bottles of water
* gallon size ziplock bag
* 2 or 3 feet of folded, heavy-duty aluminum foil
* a trash bag or two (for laundry, etc)

When you are deployed, is there a possiblity that noise levels or interference will be such that you can't use your radios? Or, is there ever a time when you will be in an emergency situation and will also be away from your radios? If so, do you have any means of getting someone's attention other than throwing something at them? If not, you might want to consider packing and/or carrying a whistle and an unbreakable mirror.

Will you ever be in a situation where the water you are carrying will be insufficient and additional clean water is unavailable? If so, you might want to consider carrying at least a filtration straw and/or bottle of purification tabs.

When you are deployed, is there always a bathroom, latrine, or a porta-potty available? If not, you may want to add a folding shovel so you can dig a cat hole when nature calls. For what it's worth, I understand that the military issue tri-folds are much better quality than the imitations, and the pack cloth covers are much better than the rubber ones.

Speaking of latrines and the like, you might want to add some moist wipes as an alternative to the toilet paper. When the 'roids kick up, or you are irritated back there, or your diet has made it difficult to get clean, nothing beats the TLC of the wipes. Cottonelle makes some really nice ones. Wouldn't hurt to carry a few in the truck, too.