The battleship is a type of capital Ship that is heavily armed and armored. Some battleships are referred to as dreadnoughts, such as the United Nations Navy's (UNN) third-generation battleships (including the Xerxes-class and Truman-class) which represent the third redesign since the buildup of the first conflict between Earth and Mars. The battleship designation can be applied to ships from any fleet including but not limited to those of the Martian Congressional Republic Navy (MCRN), UNN, and some very powerful megacorporations. These ships can take a lot of punishment during battles between ships. However, during one such engagement between the MCRN Donnager and six unidentified ships equipped with advanced stealth technology, torpedoes, and railguns, the MCRN battleship initiated the Condition Zero failsafe protocol that would self-destruct the ship if either the bridge, Command Information Center (CIC), or engineering are breached by boarders.