4-89. Explosive ordnance disposal teams and chemical, biological, radiological, nuclear, and explosive response teams respond to CBRN incidents in support of a combatant commander. If requested, they respond to USNORTHCOM and USPACOM for specialized domestic CBRN incident support. Support includes unknown explosive ordnance, improvised explosive devices, homemade explosives and weapons of mass destruction, movement of munitions, and disposal of unusual unexploded ordnance. These units frequently deploy for NSSEs. The CBRN incident response teams deploy with mission specific sustainment capabilities, but life support assistance comes from the supported combatant commander.