At what MOPP level do personnel wear their gas masks on their person?

Personnel are required to wear their gas masks on their person at MOPP level 2. This protocol is established because MOPP level 2 signifies an increased readiness to chemical, biological, radiological, and nuclear (CBRN) threats. At this level, personnel must ensure that they can quickly don their masks if a chemical agent is detected or an attack is anticipated.

The practice of keeping the masks on their person allows for immediate access and minimizes the time it takes to protect oneself in a hazardous environment. It's a crucial step in the escalation of preparedness that begins at MOPP level 1, where the mask is not worn but must be readily accessible. As personnel progress to higher MOPP levels, the level of protective equipment and action taken increases, but it is specifically at level 2 that masks are required to be kept on the individual.