Windows Tablets with a MIL810F/G rating must be able to withstand a variety of environmental and physical factors.  The Military 810F/G standard is comprised of a large rnumber of tests, not all of which would apply to tablet computers.  

For each product defining adherance to MIL-810 there should be an accompanying description of what tests have been pased.  Most commonly these are shock (drop to concrete), vibration, temperature and humidity.