Indeed, the best guarantee of American extended deterrence over Japan remains the presence of nearly 50,000 American troops (which Japan helps to maintain with generous host-nation support). Credibility is also enhanced by joint projects such as the development of regional ballistic missile defense.
实际上，美国对日延伸威慑的最佳保障依然是近50，000名美军的进驻（这支部队的存在也有赖于日本慷慨的东道支持）。发展地区弹道导弹防御等联合项目也提高了同盟的可信度。