A Sentry turret is a weapon created by Han Industries to wage war between the Global Defense Initiative and its enemy, the Brotherhood of Nod. The weapon was created by the start of a First Tiberium War which is between 1999 and 2002 by Kane on one side and US President, Robert Fielding on the other led by his other co-operative friend, Francis Weatherell of England. Sentry turrets can open fire their shots like a machine gun on enemy infantry, but not tanks or aircraft. This is named after the Soviets used a Sentry Gun in the 1970s and upgraded another Sentry Gun in 1986 when the War of Three Powers began in both Leningrad and Vorkuta. Also, the Soviet Union used the Sentry Gun as their first defense structure in the late 1940s and early 1950s.