A key component of an air-launched missile defense system demonstrated its ability to acquire and track a ballistic missile target in the boost phase, according to Raytheon.

日前，一种空射导弹防御系统的关键组成部分成功演示了对助推段弹道导弹的截获与跟踪能力。

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Now the Defense Department has notified Congress that the Navy will design the next generation of ballistic-missile submarines with the flexibility to accommodate female crew members.

现在国防部已经通知国会说，海军将会设计下一代可以灵活适应女性船员居住的弹道导弹潜艇。

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These new capabilities will be built upon an open systems infrastructure to facilitate the ability to incorporate any sensor and weapon system into the Ballistic Missile Defense system (BMDS).

这些新功能将建立在一个开放式系统架构，以便将任何传感器和武器系统纳入弹道导弹防御系统(BMDS)。

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"This new ballistic missile defense program will best address the threat posed by Iran's ongoing ballistic missile defense program."

VOA: standard.2009.09.17

"Ballistic missile defense is without question an important part of our current and future strategy.

VOA: standard.2010.03.26

Japan's defense minister, Yasukazu Hamada,said whether Pyongyang actually launches a satellite or a ballistic missile the country's military force is prepared to protect the nation.

VOA: standard.2009.04.03

We designated the Supreme Allied Commander of Europe, Admiral Jim Stavridis, as the commander for the ballistic defense mission.

WHITEHOUSE: Press Briefing on NATO Defense Capabilities

The U.S. needs no theater ballistic defense missiles deployed on its territory (Canada and Mexico are not a threat), and so will have none available to help with defense against strategic missiles.

CENTERFORSECURITYPOLICY: Multilateral madness

The Quadrennial Defense Review and Ballistic Missile Defense Review, which Secretary Gates released two weeks ago, present a plan to further strengthen our preeminent conventional forces to defend our nation and our allies.

WHITEHOUSE: VP Biden: The Path to Nuclear Security