The US and Israel are conducting biennial joint military exercises, known as Juniper Cobra. The build up started weeks ago and the real action began a few days ago.
The US has deployed at least two naval vessels, 2500 troops, multiple missile defense systems and lots of aircraft to Israel. Along with those assets, Israel has also deployed the Iron Dome, Arrow and David’s Sling defense systems. Part of the exercise is coordination of those missile defense systems to “layer” protection of Israel and other US/Israeli interests in the area.
You will find more information, including photos and a video at The Jerusalem Post’s article, US and IDF Troops, In Major Joint Drill, Simulating Battle on Three Fronts.