(Borrowed from Wikipedia)

In the U.S. military, the term REDCON is short for Readiness Condition and is used to refer to a unit's readiness to respond to and engage in combat operations. There are four REDCON levels, as described below in this excerpt from Army Field Manual 71-1.

Full alert; unit ready to move and fight.

• WMD alarms and hot loop equipment stowed; OPs pulled in.
• All personnel alert and mounted on vehicles; weapons manned.
• Engines started.
• Company team is ready to move immediately.

• WMD alarms and hot loop equipment stowed; OPs pulled in.
• All personnel alert and mounted on vehicles; weapons manned.
• Engines started.
• Company team is ready to move immediately.

Full alert; unit ready to fight.

• Equipment stowed (except hot loop and WMD alarms).
• Precombat checks complete.
• All personnel alert and mounted in vehicles; weapons manned.
• (NOTE: Depending on the tactical situation and orders from the commander, dismounted OPs may remain in place.)
• All (100 percent) digital and FM communications links operational.
• Status reports submitted in accordance with task force SOP.
• Company team is ready to move within 15 minutes of notification.

Reduced alert.

• Fifty percent of the unit executes work and rest plans.
• Remainder of the unit executes security plan. Based on the commander’s guidance and the enemy situation, some personnel executing the security plan may execute portions of the work plan.
• Company team is ready to move within 30 minutes of notification.

Minimum alert.

• OPs manned; one soldier per platoon designated to monitor radio and man turret weapons.
• Digital and FM links with task force and other company teams maintained.
• Company team is ready to move within one hour of notification.

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