; or (B) is 72 inches or more above the ground, as measured on the exterior of the unit. (4) The feasibility and cost-effectiveness of modifying the requirements of such section to require windows to be equipped with fall prevention devices that meet the following requirements: (A) The device attaches to the window frame and covers the entire opening with materials of sufficient strength to withstand 60 pounds (27 kg) of force. (B) The device allows protection in case of a fully opened window. (C) The device prohibits the passage of a 4-inch rigid sphere anywhere in the window opening. (D) The device has a 2-step release mechanism that— (i) allows the window to be fully opened for emergency escape or rescue with no more than 15 lb ft of force; (ii) requires 2 distinct actions to operate; (iii) is clearly identified for use in an emergency; and (iv) is not designed in a manner which accommodates the use of locking devices which require special tools or knowledge to operate, such as combination locks or keyed locks. (5) The feasibility and cost-effectiveness of extending the requirements of such section to private housing leased or otherwise used by military families. (6) The feasibility and cost-effectiveness of other potential methods to protect against unintentional window falls by young children in military family housing units. (c) Clerical amendment The table of sections for chapter 169 of such title is amended by inserting after the item relating to section 2878 the following new item: 2879. Window fall prevention devices in military family housing units. .