US General Harold Greene
US General Harold Greene was killed and 15 others were wounded in an open fire by an alleged Afghan soldier.Reuters File

The US General's murder by an alleged Afghan soldier on Tuesday raised concern over Afghanistan's security after the US withdrew its troops. Replying to the doubts, analysts said that it gives another reason to call back forces.

"The public is exhausted by Afghanistan, and I believe is unwilling to fundamentally reconsider the approach there. I think Americans will see [the killing of the general] as another reason why the U.S. investment in Afghanistan isn't worth it," The Washington Examiner quoted Executive Director Charles Dunlap of Duke University's Center on Law, Ethics and National Security.

The US Major General Harold Greene was shot down by a man believed to be disguised as an Afghan soldier. 15 others, including German brigadier general and a senior Afghan commander were also wounded in the firing, the BBC reported.

Following the attack, several questions were raised on the US' decision to withdraw its troops, completely by the end of 2016. Many think that extremists would get an opportunity to seize the nation entirely causing a threat to its security forces, if American troops leaves Afghan.

Many others had earlier raised concerns that the target to completely counter terrorism in Afghan would be difficult to achieve and now the existing security in the country might face more threat. 

Despite the rising doubts about the US President Barack Obama's decision, a senior administration reportedly said that the order would not be changed.

Clarifying the reason behind the US' inclination towards its decision to call back its forces, analysts said that America does not want to keep a "significant US presence" in Afghan.

"In recent years, there has been some progress lessening these green-on-blue attacks – but obviously not enough, as made clear by today's tragedy," House Foreign Affairs Committee Chairman Ed Royce said.

"Many brave US forces are working hard to help stand up the Afghan forces so they can continue to take the lead in Afghanistan. That is the honorable mission for which this US officer and others have sacrificed. They don't deserve to be victims of such cowardly terrorist attacks," he added.

The White House press secretary Josh Earnest too said that the "casualty rate of American personnel" in Afghan has declined since the US announced to call back its forces.

At present, there are at least 32,000 American troops in Afghanistan, now majority of them would be called back by the end of 2014, leaving behind 9,800 of them, according to earlier news reports.