What does MOPP mean?

MOPP is an acronym for Mission Oriented Protective Posture (pronounced "mop"). The military term is used to describe protective gear to be used in a toxic environment, i.e., during a chemical, biological, radiological, or nuclear (CBRN) strike. The five MOPP levels (0 through 4) denote standard protective measures for the various levels of contamination that are encountered or expected.

MOPP protection levels

MOPP Level 0 - Protective mask worn in carrier, at side. Overgarments, gloves, and overboots accessible.
MOPP Level 1 - Chemical agent detectors worn, mask worn in carrier at side. Overgarments worn. Gloves and overboots readily accessible.
MOPP Level 2 - Overgarments and overboots worn. Gloves and mask readily accessible.
MOPP Level 3 - Mask, overgarments, and overboots worn. Gloves kept ready.
MOPP Level 4 - All protection worn.