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Learn how to read the DEFCON scale. The DEFCON scale is a way of assigning a numerical value to the readiness of the American military. Higher DEFCON values are used for lower levels of readiness (during more peaceful situations), while lower DEFCON values are used for higher levels of readiness (during tenser situations where the possibility of military action is more likely). A DEFCON level of 5 corresponds to ordinary peacetime, while a DEFCON level of 1 (which has never been reached) corresponds to the most dangerous situations, like thermonuclear war. Note that different branches of the military can be issued different DEFCON levels. For instance, during the Cuban Missile Crisis, which is generally considered one of the tensest moments in American military history, the Strategic Air Command went on DEFCON 2, while the rest of the military went on DEFCON 3.
Use DEFCON 5 for peacetime. A DEFCON level of 5 is a very good thing — this is the condition used to designate normal peacetime military readiness. At a DEFCON 5, the US military takes no wide-scale precautionary defense measures beyond what is ordinarily required. Note that DEFCON 5 isn't necessarily a sign that the world is at peace — conflicts, even major ones, may be occurring around the world during a DEFCON 5. However, in this case, the military judges that these events pose no significant defense threats.
Use DEFCON 4 for heightened alertness. DEFCON 4 is the first level of readiness above the baseline value of DEFCON 5 and thus constitutes a fairly mild increase in readiness (though an increase from DEFCON 5 to DEFCON 4 is certainly significant). This DEFCON level signifies increased intelligence-gathering efforts and, sometimes, the heightening of national security measures. However, it is not usually an indication that the military (or the nation) are in imminent danger of attack. In the modern world, it is thought that DEFCON 4 is sometimes issued after minor to moderate terrorist attacks and politically-motivated killings, or after would-be plots are uncovered. Presumably, this is done in anticipation of further violence as an attempt to prepare for and prevent it.
Use DEFCON 3 for tense military/political situations. Situations that call for DEFCON 3 are serious — though they may not pose an immediate threat to the existence or stability of the American state, they do call for significant vigilance. At this level, American military forces are put on a heightened state of alert in anticipation of mobilization — in particular, the Air Force is kept ready to launch operations with just 15 minutes of notice. In addition, all military communications may be encrypted based on classified protocols. Historically, DEFCON 3 has usually corresponded to situations in which military action against the US or one of its allies was a distinct possibility. For instance, during Operation Paul Bunyan, which resulted in a DEFCON 3, two American officers were killed by North Korean forces in the Korean Demilitarized Zone (DMZ). In this case, a DEFCON 3 was issued because of the possibility that any errors in the resulting standoff might trigger open war across the Korean border (a politically and militarily tense area then, as it is today).[3]
Use DEFCON 2 for major threats. DEFCON 2 refers to a further increase in force readiness just below maximum readiness. Combat forces are readied for major operations within just a few hours. An increase to DEFCON 2 is very serious — these situations carry a significant risk of major military operations against the United States or its allies, including the use of nuclear weapons. DEFCON 2 is typically reserved for all but the most militarily tense of international situations. The most notable time that DEFCON 2 has ever been issued was during the Cuban Missile Crisis, although this declaration was limited to Strategic Air Command. It is though that this is the only time that a wide-scale DEFCON 2 alert has been issued, though, since DEFCON-related information is usually kept classified, it is not exactly certain how many times this level of readiness has been reached.[4]
Use DEFCON 1 for maximum alertness. DEFCON 1 refers to maximum military readiness — it is thought that forces with a DEFCON level of 1 are kept ready for immediate action at all times. DEFCON 1 is reserved for the absolute most dangerous, severe situations, including imminent or ongoing nuclear war involving the US or one of its allies. Though, as noted above, DEFCON levels are usually kept classified until after the fact, it is thought that DEFCON 1 has never been issued for a branch of the US military before.
Some limited, unverifiable evidence suggests that DEFCON 1 may have been triggered for certain military units during the first Gulf War. If these claims are true, however, they only applied to individual units and not to entire branches of the military.
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