But American plans for a major war to, say, defend South Korea have in the past envisaged dispatching 20 or 21 brigades, notes the CBO.

然而美国却计划一场大战，比如说，过去设想派遣20或者21个作战旅保卫韩国，CBO指出。

youdao

The system was promoted by Mr.Obama's predecessor George W.Bush to defend against missiles launched from what he called "rogue" states such as Iran and North Korea.

VOA: standard.2009.09.17

President Harry Truman was right to commit the U.S. (under the cover of the United Nations) to defend South Korea.

FORBES: Fact And Comment

For example, it pulled out of its obligation to defend North Korea.

CNN: A complex security minuet has started in North Asia

Why are American personnel preparing for battle to defend South Korea?

FORBES: Why Are U.S. Troops Still In Korea?