U.S. Marines to probe alleged urination video (CBS News) Updated at 7:30 a.m. The U.S. Marine Corps has vowed a full investigation into video posted online which purportedly shows Marines urinating on the dead bodies of Taliban militants in Afghanistan. CBS News national security correspondent David Martin says if it turns out to be authentic, those involved could face court martial proceedings for violating U.S. military rules which specifically forbid "photographing or filming... human casualties" - regardless of whether the Americans were actually urinating. Martin says the U.S. military has told CBS News the Marines seen in the video are no longer in Afghanistan, raising a question about how old the clip may be. Regardless, the Pentagon is extremely worried about what reaction might be. The hope, Martin tells "CBS This Morning" co-anchor Charlie Rose, is that the Taliban's own unpopularity in Afghanistan will lead many in the country to see the video as an insult to the radical Islamic group, rather than to Afghan culture or Islam. Click the player above to see Martin's full report. "While we have not yet verified the origin or authenticity of this video, the actions portrayed are not consistent with our core values and are not indicative of the character of the Marines in our Corps," said the statement issued by the Marines. This matter will be fully investigated. The video was posted to YouTube by a user called "moviesoundtrackvideo" with the title "Marines urinating on dead soldiers Taliban," and while its authenticity has yet to be confirmed, Martin says the damage likely to be inflicted by the clip won't be curtailed quickly by the pledge of an investigation. Speaking Thursday to Rose on "CBS This Morning," Sen. John McCain said the video "saddens" him. The veteran senator and former Vietnam war POW said the video shows "a handful of undisciplined young people, of the 100-some-thousand Marines we have. It makes me so sad. McCain said the video would do "great damage" and urged a complete investigation, stressing that any U.S. service members found guilty "should be punished." Eight years ago in Iraq, U.S. soldiers at Abu Ghraib prison posed next to detainees in degrading positions. After the photos surfaced, some American troops were dishonorably discharged; others were sentenced to military prison. The video also comes to light as Afghanistan's leaders ratchet up pressure on the U.S. to hand over control of security and law enforcement duties more quickly. On Saturday, Afghan officials alleged that U.S. military personnel had abused prisoners at the main U.S.-run detention facility in the war-torn country, increasing their calls for the prison outside the Bagram Air Base to be turned over completely to domestic forces. While the U.S.-led war in Afghanistan has left almost 2,000 Americans troops dead, many thousands more Afghan civilians have been killed in the violence during the last 10 years, and that bloodshed has led many Afghans to deeply resent the American presence. Afghan citizens who spoke to the media Thursday reacted with predictable rage, showing that, as Martin predicted, the damage to America's image may already be done. "We don't want them anymore on our soil, we don't like foreign soldiers to be on our soil," angry Kabul resident Feda Mohammed told the Reuters news agency. They have to leave. Another big question the scandal will raise in coming days is what effect it may have on the beginning of reconciliation talks between the Taliban and the U.S. government, which seem to be looming ever larger after the recent announcement of a new Taliban liaison office in Qatar. Video: Afghan leader says U.S.-Taliban talks a good idea While both the Taliban and the U.S. government insist no direct peace talks have yet taken place, the two sides are, by all accounts, moving in that direction. Speaking to CBS News' Ahmad Mukhtar on the phone Thursday, Afghan Taliban spokesman Zabihulla Mujahid strongly condemned the video. He reiterated that talks with the Americans have not begun, but he said if they do, the video of the alleged desecration "will not harm" the dialogue.