Testifying before the House Armed Services Committee, General (rtd) John M Keane, told lawmakers that one of the way to reduce the risk post-2014 is to "authorise the targeting" of the Taliban and Haqqani leaders in the sanctuaries in Pakistan.
"Priority is to the Haqqani sanctuary because the security situation in the East is not as stable as the South," he argued.
"This would be an extension of the mission the OGA is conducting against the al-Qaeda in the FATA. Once systematic targeting commences, the sanctuary will cease to exist as we currently know it, a place where strategy, training, operational oversight, intelligence and logistics is executed, routinely, in safe haven," he said.
"Additionally, it will be a huge morale boost for the ANSF," the retired General argued.
More From This Section
Keane also recommended a residual force of 20,000 US soldiers in Afghanistan post-2014. This includes 8,000 for counter-terrorism, 5,000 trainers and 8,000 enablers, he said.
Meanwhile, another former US Ambassador to Kabul, called for warning Pakistan that any disruption in the next years general elections in Afghanistan would be considered as an hostile act by the Obama Administration.
Ronald E Neumann, the former US Ambassador to Afghanistan and presently president of American Academy of Diplomacy, said that the US should be pressing Pakistan to reinforce the border.
"We should also be clear on consequences if the electoral calendar is significantly breached or the election is disastrously mishandled," he told lawmakers.
"We should press the Pakistan government to deploy large numbers of troops to the border to reduce infiltration during the election. They have done this before and it helped," Neumann said.
"We should be prepared to be clear, initially in private, that failure to do so will be a hostile act resulting in serious reductions of aid and that we will compensate for a lack of Pakistani troops with increased air strikes in border areas whether approved by Pakistan or not," Neumann said.