"It's possible," Lt. Col. David Branham of the Air Force says, "that in our lifetime we will be able to run a conflict without ever leaving the United States."

MQ-9 Reaper
armed remotely piloted drone, being deployed in Iraq and Afghanistan late 2007

SWORDS TALON
armed remotely operated vehicle, currently deployed in Iraq

Sarin nerve gas
lethal dose: approximately 1 lb./million

Smallpox
eradicated in nature, maintained in 2(?) storage facilities

Ebola
"Ebola shows potential as a biological weapon because of its lethality but due to its relatively short incubation period it may be more difficult to spread since it may kill its victim before it has a chance to be transmitted. As a result, some developers have considered breeding it with other agents such as smallpox to create so-called chimera viruses." (wikipedia)

M-388 Davy Crockett nuclear recoilless rifle
yield: .5 Kt

MK-54 nuclear backpack
yield: 1 Kt

Little Boy
the bomb dropped on Hiroshima
yield: 16 Kt

W-80 nuclear warhead
yield: 170 Kt

B-83 nuclear bombs
yield: 1200 Kt

Tsar bomb
most powerful bomb tested (1961)
yield: 57,000 Kt

Weapon of Total Destruction (WTD) (theoretical)
radiation weapon designed to kill all human life on Earth
estimated yield: 5,000,000-10,000,000 Kt