Washington (CNN) -- As President Obama announced he's sending more troops to Afghanistan, he also took on critics who made comparisons between the current situation and the war in Vietnam.

Obama addressed those critics, who believe the area cannot be stabalized and think the United States should cut their losses and rapdily withdraw, by highlighting what he beileves are major differences between Vietnam and Afghanistan.

"Unlike Vietnam, we are joined by a broad coalition of 43 nations that recognizes the legitimacy of our action," Obama said during his speech at West Point Tuesday night. "Unlike Vietnam, we are not facing a broad-based popular insurgency. And most importantly, unlike Vietnam, the American people were viciously attacked from Afghanistan, and remain a target for those same extremists who are plotting along its border."

Experts say while there are similarities between the two conflicts, there are more differences...

... Peter Beinart, who wrote an article in October called, "Bury the Vietnam Analogy" on TheDailyBeast.com, has said there is a real sense of national identity for Afghans that wasn't seen in South Vietnam.

"Afghanistan is a real country that Afghans generally believe in. They have an Afghan national identity. That didn't exist in South Vietnam," he said, adding that the Taliban is much less popular in Afghanistan than the Viet Cong was in South Vietnam.

In Vietnam, the Communists controlled the nationalist movement and had the nationalist legitimacy. The Taliban, meanwhile, is not as organized as the Viet Cong and North Vietnamese Army were...