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SLAM is an Acronym for "Selectable Light-weight Attack Munition" (which is used in HL2DM). It is essentially an advanced and "safer" Land Mine. They are real, and are used by the U.S Army.
Read about it here:
http://www.atk.com/internationalproducts/interprod_slam.asp
Read about it here:
http://www.atk.com/internationalproducts/interprod_slam.asp