Sorry, my original response was posted from work, in the very end moments of my lunch hour. Now I have a bit more time...
To begin with, from the original posters query, I assumed we were discussing modern, mobile, vehicle-mounted, tactical theater air defense. Basically, a vehicle that would/could travel with an armored column and/or convoy, and protect it from enemy airstrike(s). This basically rules out man portable missile systems (not saying a guy with a Stinger in back of a truck would be a bad thing to have along, but rather that it falls outside of the scope of this discussion), and fixed site systems that require extensive set-up.
That said, let's take a look at what we (do not) have:
The M163 Vulcan Air Defense System (VADS) is a self-propelled anti-aircraft gun (SPAAG) that was used by the United States Army. The M168 gun is a variant of the General Dynamics 20 mm M61 Vulcan rotary cannon—the standard cannon in most US combat aircraft since the 1960s. Eventually the M48 and M163 were both replaced in US service by the M1097 Avenger and the M6 Linebacker.
Note the part about it being phased out and replaced.
The M247 Sergeant York DIVAD (Division Air Defense) was a self-propelled anti-aircraft weapon (SPAAG), developed by Ford Aerospace in the late 1970s. Based on the M48 Patton tank, it replaced the Patton's turret with a new one that featured twin radar-directed 40 mm rapid-fire guns. It was intended to replace the M163 Vulcan Air Defense System and fight alongside the M1 Abrams and M2 Bradley fighting vehicles in the U.S. Army. However, despite the use of many off the shelf technologies, a series of technical problems with the system and cost overruns caused the cancellation of the project in 1985.
This one never came to fruition. Too bad, as it would be a nice one to model, and used an existing chassis. Let's move on to missiles, which the Army seems to favor for this sort of work.
MIM-72A/M48 Chaparral is a US Army self-propelled surface-to-air missile system based on the AIM-9 Sidewinder air-to-air missile system. The launcher is based on the M113 family of vehicles. It entered service with the US Army in 1969 and was phased out between 1990 and 1998. It was intended to be used along with the M163 Vulcan Air Defense System, the Vulcan covering short-range short-time engagements, and the Chaparral for longer range use.
Phased out. Also too bad, as I'd have liked to haved one paired with a M-163. These next few sort of go together, as the missile systems are all very similar, but mounted on different chassis:
NOT PICTURED: LAV-AD
M6 Linebacker
M6 Linebacker, an air defense variant, these vehicles are modified M2A2's with the TOW missile system replaced with a four-tube Stinger missile system. These are due to be retired from U.S. service.
Further notes: Army-Technology.com notes that 99 total M6 Linebacker units were delivered to the U.S. Army, and that In February 2005, United Defense was awarded a contract from the US Army's Tank-automotive and Armaments Command to remove the Stinger missile systems from 88 Bradley Linebackers and convert the vehicles to standard M2A2 ODS infantry fighting vehicles by June 2006.
The Avenger Air Defense System provides mobile, short-range air defense protection for ground units against cruise missiles, unmanned aerial vehicles, low-flying fixed-wing aircraft, and helicopters. The Avenger was originally developed for the United States military and is currently used by the Army. Until recently, the system was also used by the Marine Corps.
LAV-AD (Air Defense)
LAV fitted with an electric turret mounting a 25 mm GAU-12 Equalizer gatling cannon, and two, four missile pods, which contain FIM-92 Stinger SAM. It carries 990 rounds of 25 mm ammunition, and 16 FIM-92 Stinger missiles. This variant has been removed from service.
So, of the trio, only the HMMWV version remains in use. I'm somewhat surprised that there doesn't seem to be much talk of an air defense version of the Stryker, but when considering the Army's history I guess it makes sense, why introduce one just to phase out...
There does seem to be something interesting on the horizon, Raytheon successfully tested launching AMRAAM missiles from a five-missile carrier on a M1097 HMMWV (hum-vee). This system will be known as the SLAMRAAM (Surface Launched (SL) and AMRAAM). They receive their initial guidance information from a radar not mounted on the vehicle.
While still under evaluation for replacement of current US Army assets, the SL-AMRAAM has been deployed in several nations military forces. The US Army has test fired the SL-AMRAAM from a HIMARS artillery rocket launcher as a common launcher.
I'm sure I could go on, as the lack of a suitable anti-air platform is a bit of a pet peeve of mine, but this should give you enough basic info to start with. My own 1:32 troops, they are always on the lookout for serviceable ZSU-23-4 and ZSU-57-2 vehicles they can press into service...
MV
