Includes medicine for faster blood coagulation, as well as painkillers, antibiotics, immunity stimulators, and more. It is usually used by members of the Military (including the Spetsnaz and therefore Military Stalkers), and members of the Duty faction.
Army medkits are rarer and more effective than the regular medkits, and are primarily carried by the military. As such, they are quite valuable and selling them can lead to a good monetary gain.
Shadow of Chernobyl
A specialized medical set to fight against physical damage and blood loss. In it is included a component for blood coagulation, antibiotics, immunal stimulators, and painkillers.Shadow of Chernobyl in-game description
Army first aid medkits can be found on most veteran and expert Stalkers, as well as most Military soldiers, used in place of regular Medkits. They are far more effective at restoring health, and also minimize bleeding, like a more effective bandage. However, they're a bit more expensive and only readily available for sale from Sakharov.
Like the standard Medkit, the Army medkit received a slight overhaul in effectiveness, usually healing over three quarters of Scar's health in one go. however, they're accordingly harder to find, and most veterans will not drop one. They can still be readily purchased from Sakharov and most faction traders for a modest sum.
Call of Pripyat
In Call of Pripyat, Army Medkits are arguably the most effective of the three. Not only do they restore more health and clot more bleeding then either regular Medkit, the Army medkit does it all in half the time. Not only does this mean the player gets the beneficial effects quicker, it means they can also use them more frequently. This however may be a double-edged sword, as it can be easy to run through Military kits in a surprisingly short period of time.
They can usually only be purchased from medics such as Tremor and Bonesetter, but most Veterans and Experts from most factions - barring Bandit and some Mercenaries - will carry at least one. Each of the nine Monolith stashes holds three army medkits in reserve, with a nice total of 27 medkits after searching all the stashes.