Article 13 (a) of the Armistice Agreement contains details about the demilitarization of the DMZ.

ARTICLE 2 CLAUSE 13 ITEM A

Within seventy-two (72) hours after this Armistice Agreement becomes effective, withdraw all of their military forces, supplies, and equipment from the Demilitarized Zone except as otherwise provided herein. All demolitions, minefields, wire entanglements, and other hazards to the safe movement of personnel of the Military Armistice Commission or its Joint Teams, known to

exist within the Demilitarized Zone after the withdrawal of military forces therefrom, together with lanes known to be fee of all such hazards, shall be reported to the Military Armistice Commission by the Commander of the side whose force emplaced such hazards. Subsequently, additional safe lanes shall be cleared; and eventually, within forty-five days after the termination of the seventy-two(72) hour period, all such hazards shall be removed from the Demilitarized Zone as directed by and under the supervision of the Military Armistice Commission. At the termination of the seventy-two (72) hour period, except for unarmed troops authorized a forty-five (45) day period to complete salvage operations under Military Armistice Commission supervision, such until of a police nature as may be specifically requested by Military Armistice Commission and agreed to by the Commanders of the opposing sides, and personnel authorized under Paragraphs 10 and 11 hereof, no personnel of either side shall be permitted to enter the Demilitarized Zone.