A United States Defense Standard often called a military standard, “MIL-STD”, or “MIL-SPEC”, is used to help achieve standardization objectives by the U.S. Department of Defense.
MIL-STD 810E refers to the type of testing that the mobile computer is put through to determine its ruggedness. Rugged mobile computers will state that it is MIL-STD 810E rated or may say it is MIL-STD 810F compliant. They both mean the same level of ruggedness is applicable. MIL-STD 810F is just a revision of MIL-STD 810E and applies more to the testing process rather than the resulting rating. MIL-STD 810E and F are the highest standards for ruggedized testing for mobile computers.