Sledgehammer Mission Support Site (also known as Sledgehammer MSS, Cu Grok, Hill 1438 or Heavy Drop) was a MACV-SOG base located west of Pleiku, in Kontum Province.

The base was located on a steep and narrow ridgeline overlooking the Plei Trap Valley, approximately 46 km west of Pleiku and 20 km east of the Cambodian border.

[1] The base was first established in March 1967 as an operations base and radio relay site to allow SOG teams to remain in contact while on operations in Cambodia.

[1] The base has reverted to jungle.

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