Selectable yield warhead and method

A method for activating a selectable yield warhead, comprising the steps of:

• (a) providing a warhead, comprising:
• a casing having one or more partitions that separate the casing into multiple compartments, each compartment including an explosive charge, and the multiple compartments include at least a first compartment with a first explosive charge and a first igniter, and a second compartment separate from the first compartment with a second explosive charge and a second igniter, the second compartment having a deflagration charge positioned against the casing to rupture the casing and to initiate deflagration;
• (b) selectively initiating the deflagration charge in the second compartment to rupture the casing and to initiate deflagration in the second compartment;
• and
• (c) initiating a first igniter to cause detonation of the first explosive charge in the first compartment of the warhead.