Vehicles
Armored Vehicles include Tanks and APCs and you can hijack both after the Wheels of Chance mission. You can consume more drivers to improve your driving and vehicle combat skills.
Helicopters can also be hijacked after the Under the Knife mission and once again you can improve your pilot skills by consuming more helicopter pilots. You can even hijack helicopters in mid air.
Weaponry
You can use the military weaponry in the game and sometimes you’ll need to. Choices include a basic machine gun, an assault rifle, a grenade launcher and best of all a rocket launcher. You can upgrade your skills by consuming more weapons experts.
For the vehicles and weaponry the targets who will allow you to upgrade skills are specially marked on the map. These are well worth pursuing and tank hijacking in particular is very useful for quickly destroying military bases and infected hives.