11 September 2001, when American leaders prepared for war
they envisioned enemies using bombs, tanks, guns, military
force, and other traditional armaments. The attacks on that
fateful day forever changed the way the United States and
the world would view the nature of war. Using four hijacked
commercial jetliners, terrorists attacked the United States,
killing some 3,000 men and women. This surprise attack was
not a symmetric attack, but an asymmetric one. Furthermore,
a non-state entity conducted this attack at a relatively low
cost of under $500,000. However, that may have
been just the beginning. The success of the attack, and the
devastation inflicted on the nation at a relatively low cost,
will doubtless inspire our adversaries to continue to employ
asymmetric methods to threaten and weaken the United States.
Among those methods may be the introduction of an invasive
species, a disease pathogen, or some other biological threat.