These are the steps to follow right before you hear “Incoming!”

An Israeli armored brigade approaches the Golan Heights to relieve forces under Syrian attack on day two of the 1973 Arab-Israeli War. U.S. fears that the Soviet Union would send troops to assist Egypt and Syria sparked a DEFCON level increase. (Corbis/David Rubinger)
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For most sailors on board the USS Wisconsin in January 1991, the first they heard of Operation Desert Storm was an announcement from the commanding officer, Captain David Bill. The battleship, Bill told them over the loudspeaker, was now at DEFCON 2. According to Robert Ruby, a newspaper reporter embedded on the ship, one officer grabbed a spy novel to find out what the alert meant.

It’s embarrassing, perhaps, but not that surprising—this concept from the depths of the cold war still has so much popular fascination it has blurred under constant use. The term shows up in TV shows and movies, video games, cartoons, songs, and even hot-sauce labels. Going to the international hackers convention? That’s a DEF CON. A high DEFCON level is now techno-slang for a situation so pressing that it needs prompt, extreme action.

What’s “high”? Screenwriters often get the scale wrong, so begin with this fact: the lower the number, the higher the worry. DEFCON 5 is peacetime, while DEFCON 1 is imminent war. Hiking the DEFCON level activates a stack of scripted plans intended for quick execution, and is comparable to “Battle stations!” on a warship facing combat.

The idea of a graded scale indicating combat readiness goes back at least to World War I, but it wasn’t until 1959, following communication mixups during a joint military air-defense exercise called Top Hand, that the United States and Canada agreed to five “defense conditions,” or DEFCONs.

Strategic Air Command crews, kept at DEFCON 4 for much of the cold war, drilled in the ’60s with Convair B-58A Hustlers. (National Museum of the USAF)
During the 1973 worldwide DEFCON 3 alert, Boeing B-52Ds at Guam’s Andersen Air Force Base were loaded with nuclear weapons. (National Museum of the USAF)
Missile wreckage near the Suez Canal. In the first days of the 1973 Arab-Israeli war, extensive use of surface-to-air missiles gave Egypt the upper hand. (Corbis/David Rubinger)
U.S. Air Force Staff Sergeant Billy Davis stands sentry at the entrance of Strategic Air Command HQ, Offutt Air Force Base, Nebraska, ca. 1960s. (NASM (SI neg.2003-158))
An airman scans for intruders at Alaska’s Elmendorf Air Force Base in 2004. Today, even without heightened alerts, if a threat is identified, more than 100 fighters at North American bases can be scrambled within 10 minutes. (AP / Al Grillo)
After the 1953 cease-fire, the Bridge of No Return was used to exchange POWs between North and South Korea. It was closed after two U.S. soldiers were murdered during the 1976 “tree-trimming” incident. (Department of Defense)
In the Joint Security Area between North and South Korea, a 1976 confrontation between U.N. and North Korean soldiers led to two deaths and a raised DEFCON level at the Korean Demilitarized Zone. (Department of Defense)
The General Dynamics F-111 participated in the worldwide 1973 DEFCON alert, as well as the limited 1976 incident in Korea. (National Museum of the USAF)

DEFCON levels are primarily for the military. But as the levels get more urgent—certainly by DEFCON 2 and 1—Americans would notice unusual activity on the streets. White House staff on duty during the Cuban Missile Crisis later recounted plans to evacuate them from Washington by helicopter. (That would have happened immediately under DEFCON 2, to be triggered if the United States moved to invade Cuba to disable the Soviet missiles there.) Preparations to flee started under DEFCON 3. High officials got pink cards authorizing helicopter seats, specifying time and location. What about their families? Kennedy press secretary Pierre Salinger received an envelope on October 27, 1962, the height of the crisis: If his wife discovered that Salinger had gone into hiding, she was to rip it open for instructions on how to slip out of the city and join up later.

Real DEFCON alerts, as opposed to the ones in movies, don’t have to directly involve U.S. global defenses. At least a dozen alerts have been called for limited geographic areas since 1959, some of them imposed by commanders for individual units. Only four world-class DEFCON hikes are known: a very brief one caused by a Soviet-American diplomatic breakdown during talks in Paris (May 1960); the Cuban Missile Crisis (October to November 1962); a U.S. alert aimed at discouraging direct Soviet participation in the Arab-Israeli war in the Mideast (October 1973); and a hasty move to raise security around military bases after the terror attacks of September 11, 2001. In the last case, the military knew that a worldwide hike to DEFCON 3 was not well suited as a response to terrorists using hijacked airliners, but according to Bruce Blair of Princeton University, in the first uncertain hours, authorities seized on it as the quickest way to secure the perimeters of U.S. military bases. Blair is the author of The Logic of Accidental Nuclear War and a former Minuteman launch officer. Side effects of the DEFCON 3 order that day included “continuity of government” routines that restricted the mobility of the president and vice president, slammed shut the blast doors at the NORAD Cheyenne Mountain Complex, and put bomber and missile bases on a short-notice alert.

No worldwide DEFCON alerts have jumped beyond level 3. The Strategic Air Command went to DEFCON 2 during the Cuban crisis, which was probably as close as the United States has ever come to tipping into a nuclear war since late 1956 (when a revolt in Hungary against the Soviets coincided with an international crisis along the Suez Canal).

Two DEFCON alerts that came late in the cold war were directly authorized by the Joint Chiefs of Staff at the direction of the White House in the hope of avoiding war: the worldwide alert in October 1973 and a limited one centered on the Korean Demilitarized Zone in August 1976. Although the decision makers intended the DEFCON orders to prevent armed engagement, there were moments in both alerts that could have gotten away from them. When I asked how close the 1976 crisis came to an exchange of bombs and missiles, one participant, an infantryman with UN command troops, suggested I put my finger and thumb together, just short of touching: “We were that close,” he said.

The events of October 1973 help explain why alerts have both risks and benefits. On one hand, calling a DEFCON hike can forestall opponents’ aggression by sending the message “We know what you’re planning and we’re ready, so don’t try anything.” But staging military alerts too frequently, or for the wrong reasons, can cause political backlash and exhaust the ranks.

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