When an attach is imminent, personnel should:

In situations where an attack is imminent, seeking immediate cover while donning protective equipment is the most prudent course of action. This strategy prioritizes personal safety by reducing exposure to potential threats, while also preparing an individual to react appropriately to the ongoing danger. Donning protective equipment increases survivability against various hazards, such as explosions or gunfire.

Taking cover can minimize vulnerability to the initial impact of an attack while ensuring that the individual is better positioned to respond to any subsequent developments. It is essential to balance immediate safety through cover with readiness by putting on protective gear, allowing personnel to be more effective in their roles if action is required.

Other choices like evacuating the area without protective measures could increase risk, leaving individuals exposed in a potentially dangerous situation. Staying in one spot may lead to vulnerability, especially if no safe instructions are provided. Calling for backup might delay necessary action, reducing the chances of remaining safe during an imminent threat. Each of these alternatives does not equally address the immediate need for safety and preparedness that the correct option provides.