ISIS has been losing some territory recently, but the Islamist group is carrying out more attacks than ever before.
One of the reasons that ISIS has been able to keep up its offensive operations is that has lot and lots of military equipment, much of it captured from the Iraqi.
That's why ISIS has so much weaponry that originated in the US — the US gave loads of military hardware to the Iraqi army and ISIS took lots of it from them during a series of military victories.
Here are just a few of the weapons in ISIS' arsenal.
T-55 Tanks
It is estimated that ISIS has about 30 T-55 tanks, although it is unknown how well the organization can maintain and operate them. The T-55 tank series is a Soviet tank line that was produced from the end of World War II through the 1980s.
Despite the tanks' age, they remain operational in up to 50 armies around the world. The tanks feature heavy armor, along with a 100-mm rifled gun and a secondary 7.62-mm machine gun.
T-62 Tanks
ISIS has an estimated 15 T-62 model tanks. The T-62 was the main Soviet battle tank that was developed to replace the T-55. This tank was used extensively by the Iraqis to considerable success during the Iran-Iraq war.
The T-62 is heavily armored, and is armed with a 115-mm tank gun along with two secondary machine guns.
T-72 Ural Tanks
The militants have an estimated five to 10 T-72 tanks, although it is unknown whether they will be able to keep the vehicles in working order. The T-72 tank is the second-generation Soviet battle tank. These tanks first entered production in 1971, and they are still rolling off the assembly line.
The T-72 is heavily armored and features a 125-mm main gun. It is also armed with a secondary machine gun and an antiaircraft gun.
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