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The 9K37 "Buk" is a Russian large, tracked medium range surface-to-air missle. It is designed to destroy hostile cruise missiles, aircraft, helicopters and unmanned aerial vehicles. The 9K37 can be seen as a static vehicle in multiple levels in Call of Duty 4: Modern Warfare and Call of Duty: Modern Warfare 2.

Call of Duty 4: Modern Warfare
The 9K37 can first be seen in the campaign level "Crew Expendable" in the cargo hold of the container ship. Several 9K37s are visible in "The Coup" at a large OpFor military base the player passes. However, it is not seen being deployed against the US coalition force. The 9K37 makes its final appearence of Call of Duty 4: Modern Warfare on the mission "All In," where multiple 9K37s can be seen surrounding the missile base. The 9K37 plays an inconsequential role to the plot and only appears as scenery. The multiplayer map of "All In", "Countdown", like the singleplayer map features heavy numbers of 9K37s as scenery.

Call of Duty: Modern Warfare 2
In the campaign mission "Of Their Own Accord " a single 9K37 can be seen at the SAM battery near the World War II Memorial. Following "Of Their Own Accord" in "Contingency" at least two 9K37s can be spotted at the sub base. A 9K37 also appears in one of the warehouses on the multiplayer map "Quarry"

Trivia

 * The 9K37s are indestructible, they appear solely as scenery and are not interactive.