In an effort to update and upgrade its air defense systems, the U.S. Army delivered the first four operational Stryker anti-aircraft vehicles. 

The 5th Battalion, 4th Air Defense Artillery Regiment (5-4 ADA), under the 10th Army Air and Missile Defense Command, is the first battalion in the Army to test, receive, and field the Mobile Short Range Air Defense (M-SHORAD) system. The 5-4 ADA is based at Shipton Kaserne in Ansbach, Germany.

The M-SHORAD is placed on the lightly armored 8×8 Stryker vehicles. These variants are fitted with an autocannon and a missile launcher capable of firing Hellfire or Stinger anti-aircraft missiles. They will replace the 1980s-vintage Avengers, a variant of the 4×4 Humvee that can only fire Stingers. The Avenger was less mobile and much more vulnerable. 

At one point, the Army had 26 battalions of Avengers. But during the wars in Iraq and Afghanistan, where the enemy had little to no airpower, the military neglected its air defense capabilities. By 2017, active-duty units were down to just two battalions, with National Guard units having seven. 

An M-SHORAD system. (U.S. Army)

The Skies Are Once Again Dangerous

But things began to change. In 2014, when Russia annexed Crimea it used drones to great effect. Furthermore, the Syrian civil war witnessed the Turkish military forces using drones. Russian and Turkish drones were also used during the war in Libya.

The threat of drone attacks on heavy troop concentrations was brought to the forefront last year during the war over Nagorno-Karabakh. In that conflict, Azeri military forces used Turkish and Israeli drones to devastating effects on heavy Armenian armored formations

Iran has also developed a large drone fleet. Crucially, it is beginning to show up with its proxy forces in Syria, Lebanon, Iraq, and Yemen where Houthi rebels have launched drone attacks on Saudi Arabian oil facilities and airbases.

China is likewise developing its drone fleet.