Obama outlines strategy for 'successful conclusion'

Update: 8:35 p.m. ET: Obama ends his address saying, "America – we are passing through a time of great trial. And the message that we send in the midst of these storms must be clear: that our cause is just, our resolve unwavering."

Update: 8:14 p.m. ET: Obama says,  "It is in our vital national interest to send an additional 30,000 U.S. troops to Afghanistan."

Update: 8:05 p.m. ET: President Obama begins outlining his strategy for the war in Afghanistan, a strategy he says will bring the war "to a successful conclusion."

Update: 6:36 p.m. ET:  'Common security of the world' is at stake, Obama to tell the United States in a televised address, according to excerpts from the speech.

Update 12:17 p.m. ET:  President Barack Obama intends to conclude the Afghanistan war and withdraw most U.S. troops within three years, according to senior administration officials.

Washington (CNN) - President Obama is sending 30,000 additional troops to Afghanistan, White House officials tell CNN.

The president will travel to the U.S. Military Academy in West Point, New York, for a speech to the nation that is expected to announce his second escalation of U.S. forces in Afghanistan since he came to power in January.

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