HAVOK tactical nuclear weapon

The HAVOK thermonuclear warhead is mainly used in missiles fired by UNSC Bombers or Cruisers. However, an alternate use is to simply place the warhead on a ground target and detonate it with a remote. Its yield is thirty megatons

Around July of 2552, during the battle of Sigma Octanus IV, Blue Team detonated a HAVOK nuclear warhead at the city of Cote D'Azur, destroying the city and the Covenant in it.

Trivia

 * Each HAVOK weighs about 5-6 tons.
 * Not likely named after the physics engine Bungie uses, HAVOK. The Fall of Reach was published in 2003 whereas the HAVOK Physics Engine was not implemented into the series until Halo 2, which was released a year later.