Housing sea U.S. Marine ordered the first 42 120-mm mortar PERM (Precision Extended Range Munition — clear ammunition extended range). They own a range of about 17 km and an integrated guidance system ensures accuracy rate of about 20 meters. Several companies will present their version of PERM and as a result of the contest will last for 2 years will be chosen the most reliable among them. This is part of efforts to build the Marine Corps advanced 120-mm mortars.
Three years back, after 6 years of development and different shuffles papers U.S. Marine Corps eventually ordered the first 20 models EFSS (Expeditionary Fire Support System). Earlier in 2009, an artillery battalion of marines for the tests were given six systems (each of which consisted of a 2-car, 1st 120-mm mortar trailer with ammunition and other equipment).
EFSS purpose to make it the newest lightweight, self-propelled artillery system. Initially, the developers have joined the existing commercial vehicle, Supacat HMT (Highly Mobile Transport) with a 120 mm mortar system. Car excessive cross HMT 4×4 weighs seven tons and has a carrying capacity of 3.2 tons. It will equip the engine to 180 horsepower, while the 4×4 drive optimized for movement on rough terrain. The cabin has been specially modified to accommodate five armed members of the crew.
The project had significant delays associated with checking transportability HMT on MV-22 and CH-53E. Tiltrotor MV-22 proved to be very narrow for the HMT and most of the other available tf. Marines had to choose another ton ITV (Internally Transportable Jeep). It consists of a modified version of the car Growler — SUV's are usually sold at a cost of about $ 8,000. But after all the configurations made it cost the Marines of $ 100,000 for each ITV. In principle, Growler is a modification of an old (replaced by Hummer in the 1980s), the M-151 Jeep.
The mortar weighs 818 kg and is mounted on a computer-controlled carriage. Firing range ordinary 120-mm shells is 8.2 km or 17 km mines with jet accelerator. That's less than the 155-mm howitzers, but the Marines believe that when necessary aircraft and missiles able to hit targets at a greater distance. Charging mortar breech provides high rate of fire, system fire control receives data specifically on advanced monitors and rapidly induces 120-mm mortar on the target. EFSS capable of hitting a target within minutes after receiving the order. The system allows you to shoot 20 rounds of two minutes and uses a fire control system, curb GPS, which provides accuracy comparable to that of at least some other artillery system.
120mm Mortar ammunition weigh approximately half 155 mm projectiles. This difference is more than offset by the highest rate of fire and the introduction of several types of cluster munitions. For example, one such mine will kill most of the armored vehicles and kill or injure a large part of the enemy in a square 100×100 meters. Any of the 32 ammunition this mine hit a 100-mm armor, so makarom hitting armored vehicles with narrow upper armor.
The Marines chose the 120-mm mortar 155 mm howitzer, mortar as easier, quick, mobile and using the respective ammunition in the same destructive as a huge howitzers.