A fourth-degree or class four droid was a droid programmed for military and security purposes. Such droids tended to perform tasks wherein violence or combat might be expected. Assassin droids, battle droids, probe droids, and security droids were fourth-degree droids.

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SourcesEdit

I find your lack of sources disturbing. This article needs to be provided with more sources and/or appearances to conform to a higher standard of article quality.

• The New Essential Guide to Droids
• The Complete Star Wars Encyclopedia, Vol. I ("Droid")
• Scavenger's Guide to Droids