Several variants of the HAVOK nuclear device have been developed for use in different tactical situations, from ordnance deployed by ground forces to missile-based delivery systems.
The featured one here is the Mark 2556 Medium Fusion Destructive Device which is an excavation-grade variant of the weapon that is presumably less powerful, but can still be used in a missile and to destroy ships and other targets.
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Name: HAVOK Tactical Nuclear Weapon
Classification: Nuclear orbital bomb that yields 30 megatons
Speed: None, freefalling speed