The public affairs officer for the 1st Battalion, 44th Air Defense Artillery Regiment (1-44th ADA), part of the 69th Air Defense Artillery Brigade at Fort Hood, told The War Zone that the unit was executing a relatively rare deployment where they set up shop in an unfamiliar location, just as they would during a crisis. After setting up their gear, which as you can see in the images below is quite extensive, as well as an operations center, they will operate as they would in a wartime-like setting and run drills associated with a real-world deployment, This includes defending against air-breathing threats, such as airplanes and cruise missiles, and high and fast-flying ballistic missiles. It's worth noting that there are no live missiles being used as part of the training evolution.
There will also be an opportunity for ROTC Cadets from nearby Texas A&M University to take part in the exercise and see what one of the Army's top air defense battalions looks and operates like during an actual deployed operation.
https://www.thedrive.com/the-war-zone/37196/a-patriot-missile-battery-has-suddenly-appeared-at-a-small-regional-airport-in-texas