"The drawdown of troops has imperiled the US ability to monitor and mentor the ANDSF [Afghan National Defense and Security Force]," Sopko told the US House of Representatives Subcommittee on Oversight and Investigations.
Sopko noted that US military advisors and their coalition partners have little or no direct contact with the ANDSF units below the army headquarters and regional police headquarters level.
"This provokes the obvious question: Is the current level of US military personnel in Afghanistan adequate to ensure that the ANDSF do not fail their mission," he added.
President Barack Obama has scaled back plans to reduce US forces below the present level of less than 10,000. Moreover, the president has abandoned his goal of ending the nation’s military involvement in Afghanistan by the end of his presidency.
According to the United Nations, the Taliban now control more territory than at any time since 2001.