"The XM17 Energy Defense Apparatus, known more commonly as the XM17 Shield System, was a type of United Nations Space Command Naval defense mechanism; the system employs a combination of reverse-engineered Covenant energy shield technology along with human ingenuity. In field testing, the XM17 proved to be resistant to four standard magnetic accelerator cannon rounds before collapsing."@en . . . . "XM17 Energy Defense Apparatus"@en . . "The XM17 Energy Defense Apparatus, known more commonly as the XM17 Shield System, was a type of United Nations Space Command Naval defense mechanism; the system employs a combination of reverse-engineered Covenant energy shield technology along with human ingenuity. In field testing, the XM17 proved to be resistant to four standard magnetic accelerator cannon rounds before collapsing."@en . . . . . .