To be more specific, they are referring to most of the Lenovo ThinkPad series laptop which meets the US Dept of Defense's MIL-SPEC standards for equipment operation in field and in harsh environments. The least expensive ThinkPad series that have been designed to meet the MIL-SPEC requirements is the ThinkPad L. The ThinkPad E is Lenovo's least expensive business laptop, but it does not meet the MIL-SPEC requirements.