The army has purchased a purpose-built armored car, the
M1117 Armored Security Vehicle in limited numbers for use by the United States
Army Military Police Corps. In 2007, the Marine Corps announced an intention to
replace all HMMWVs in Iraq with MRAPs due to high loss rates, and issued
contracts for the purchase of several thousand of these vehicles, which include
the International MaxxPro, MATV, the BAE OMC RG-31, the BAE RG-33 and Caiman,
and the Force Protection Cougar, which have been deployed primarily for mine
clearing duties. Heavier models of infantry mobility vehicles (IMV) can also be
used for patrol vehicles. The Maxxpro Line has been shown to have the highest
rate of vehicle rollover accidents to its very high center of gravity and
immense weight. The massive weight of these vehicles combined with their high
center of gravity also greatly reduces their utility in off road situations
versus the HMMWV which was the primary cause for the push for the M-ATV to be
developed quickly.
Humvee replacement process The Humvee replacement process,
now being undertaken by the U. S. military, is focused on interim replacement
with MRAPs and long-term replacement with the Joint Light Tactical Vehicle
(JLTV). The HMMWV has evolved several times since its introduction, and is now
used in tactical roles for which it was never originally intended. The military
is pursuing several initiatives to replace it, both in the short and long
terms. The short term replacement efforts utilize commercial off-the-shelf
vehicles as part of the Mine Resistant Ambush Protected (MRAP) program. These
vehicles are procured to replace Humvees in combat theaters. The long term
replacement for the Humvee is the Joint Light Tactical Vehicle which is
designed from the ground up. The Future Tactical Truck Systems (FTTS) program
was initiated to make an analysis of potential requirements for a Humvee
replacement. Various prototype vehicles such as the Millen Works Light Utility
Vehicle, and the ULTRA AP have been constructed as part of these efforts.
The U. S. Marine Corps issued a request for proposals (RFP)
in 2013 for its Humvee sustainment modification initiative to upgrade 6,700
expanded capacity vehicles (ECVs). The Marines plan to field the Joint Light
Tactical Vehicle, but do not have enough funding to completely replace all
Humvees, so they decided to continue sustaining their fleet. Key areas of
improvement include the suspension, engine, and transmission. Upgrades to the
suspension would reduce the amount of force transferred to the chassis,
lowering operation and maintenance costs. Additionally, upgrades to the engine
and transmission would help to make the vehicles more fuel efficient, and
enhancements to the cooling system will better prevent overheating. The Marine
Corps is also looking at incorporating a central tire inflation system to allow
for reduced tire pressures during off-road use to improve mobility and ride
quality. They are also seeking to increase the underbody survivability. Testing
of upgraded Humvees will occur in 2014, with production and installation
occurring from 2015 through 2018.
Older A2 series Humvees make up half the current fleet, and
4,000 are to be disposed of through foreign military sales and transfers. By
2017, the Marines’ light tactical vehicle fleet is to consist of 3,500 A2
series Humvees, 9,500 ECV Humvees, and 5,500 JLTVs, with 18,500 vehicles in
total. Humvees in service with the Marine Corps will be upgraded through 2030.
Oshkosh Corporation is offering Humvee upgrades to the Marine Corps in addition
to its JLTV offering. Oshkosh has developed modular and scalable Humvee upgrade
solutions, providing varying levels of capabilities at a range of price points,
that can be provided individually or as complete solutions for upgrading all
critical vehicle systems. Their approach addresses requirements for engine and
powertrain, suspension, driveline, hubs and brakes, frame and hull, electrical,
cooling, and auxiliary automotive improvements. The TAK-4 independent
suspension system delivers 70 percent off-road profile capability, improved
ride quality, and a 40 percent increase in maximum speed. It also gives greater
whole vehicle durability, a restored 2,500-pound payload capacity, and a
restored ground clearance of 17 inches. Oshkosh also can deliver a modern
engine option that's more powerful than the Humvee's stock engine and provides
increased fuel efficiency. The U. S. Army and Marine Corps have vowed
commitment to buying nearly 55,000 JLTVs even in the face of sequestration
cuts. This level of support is given while major acquisition programs like the
Ground Combat Vehicle were in danger of cuts (and eventually cancelled), which
potentially meant the Army favored replacing Humvees more than the M2 Bradley.
How many light vehicles that will need to be reduced are still being
determined, but they are hoped to direct the effects to the existing Humvee
fleet.
In October 2014, Northrop Grumman unveiled a new chassis and
power train for the Humvee that would combine the mobility and Payload
capabilities of original vehicle variants while maintaining the protection
levels of up-armored versions. During operations in Iraq and Afghanistan, the
threat of IEDs and close-range combat prompted the addition of armor to Humvees
to increase protection, but it was heavy which decreased fuel economy and
mobility and increased stress on the chassis. Lower fuel efficiency increased
the need for tanker trucks to supply them, threatening logistics through more
traffic on vulnerable roads. The new chassis increases fuel efficiency to 16-18
miles per gallon and allows the vehicle to accelerate to over 60 mph (97 km/h)
in 22 seconds. Installation can be done through removing the six attachment
bolts and the electrical connections, lifting the body of the Humvee off,
rolling the old chassis out, and rolling the new chassis in; the chassis
includes a new power train, Transmission, and transfer case. Although the Army
has not signed off on the upgrades, the company has installed the new chassis
on four Humvees through a cooperative agreement with the Army, two of which
have been delivered for trials.
SCTV
Textron has offered another Humvee upgrade option to rival
Northrop Grumman's. Called the Survivable Combat Tactical Vehicle (SCTV), it
not only restores mobility but improves survivability over armored Humvee
levels. It was developed as a blast protected cab solution with a stronger
frame and suspension with underbody armor and the ability to mount additional
B-kit armor. It has a 6.7L 275 hp engine system with 2500 SP Allison
transmission that can power an increased gross vehicle weight of 18,500 lb
(8,400 kg) (verses 13,450 lb (6,100 kg)) with four more inches of ground
clearance, one-inch larger brakes, larger wheels and tires, and an improved internal
layout with four inches of additional headroom. The battery pack was moved from
under the passenger seat to outside under the hood and the 27-gallon plastic
fuel tank was changed to a 40-gallon stainless steel container moved from under
the transmission tunnel to behind the back wall.
Available in four-door, two-door ambulance, and nine-seat
troop carrier variants. The SCTV costs $200,000 compared to $145,000 for
Northrop Grumman's solution, but the company claims It can restore the Humvee
for operational use while the JLTV takes time to be introduced; both the Army
and Marines have acquired about half a dozen vehicles each for testing.