This is the official 2018 season kickoff for Sitrep, a (mostly) regular Ars video series. We’ll be presenting quick updates every few weeks on the latest tech-focused developments in defense and national security and how those developments affect the world at large.

Video edited by Justin Wolfson. Click here for transcript. (video link)

For much of February—and in some places, well into March—the US military will be jamming signals from the Global Positioning System as part of training exercises over vast swaths of the Western United States, as well as in smaller areas surrounding major military facilities across the US.