Thermite is part of the US Navy Emergency Destruction Plans of certain Navy Units. One form is a grenade and the other form is “document destruction.” A grenade is placed on the very top of certain electronic devices. When activated it burns all the way down. To keep this from progressing through the ship sand is always under these devices. “Document destruction” devices are placed in the drawers of certain safes. Like making a sandwich you
put one every so many inches of documents you wish to destroy. The “document destruction” devices are set off electronically by the last person leaving the spaces.