No. People see "defense" and immediately think everything is a weapon, for some reason. The DoD is still an organization with exactly the same business functions as wherever you work. This is likely going to be something more or less like the ChatGPT for Gov thing. You ask it to summarize videos and articles, review a document you're writing, spruce it up, whatever the rest of you are doing with LLMs, but you're allowed to use it from a locked down DoD workstation that can't access public web services.