This article needs some expansion based on the fact that, well, there are actually three different types of Sentinel robot.
Much random model recycling. The Head Guard and the other guards aren't identified as Sentinels in Desertion - although Shockwave refers to testing "Sentinel guard response time" in Revenge, and those guys use the same model as the Head Guard...
("Sentinel Guard" doesn't appear to be a proper noun, as "guard" is in lower-case in the dialogue script.) --Monzo 01:12, 3 October 2007 (UTC)