During the Galactic Empire's occupation of Lothal, a model of sentry droid was deployed to patrol Imperial installations. The droid used on Lothal often operated in groups of three, and was visually similar to the observation droid used by the Galactic Republic during the Clone Wars, for they both sported a large, central red photoreceptor as well as an antenna. However, the Imperial Lothal model had an additional built-in blaster with a barrel portruding from the droid's body, from which it was able to rotate around.
In 2 BBY, multiple DT-series sentry droids were stationed on an Imperial class four container transport that drifted into a storm on Wynkahthu. The droids and the ship were destroyed during a skirmish with the Spectres, Hondo Ohnaka, and Azmorigan.
- Star Wars: The Force Awakens: The Visual Dictionary (First identified as sentry droid)
- Star Wars: Complete Locations
- Star Wars: Build Your Own R2-D2 8 (Droid Directory: Imperial Mark IV Sentry Droid)
- Star Wars: Imperial Assault – Heart of the Empire (Card: Sentry Droid) (backup link)
- Cyphers and Masks