Commenting on the continuing military operations against the Taliban, the top American commander in Afghanistan, Gen. John F. Campbell, vehemently denied accusations that he was putting troops into harm’s way just to enable more airstrikes.

He has insisted that it is within his purview to target Taliban insurgents who pose a threat not just to American or NATO troops but to any Afghan security forces. And his options on the ground were clear, he said in an interview, even if Washington’s public description of them was not.

“Washington is going to have to say what they say politically for many different audiences, and I have no issue with that,” General Campbell said. “I understand my authorities and what I have to do with Afghanistan’s forces and my forces. And if that doesn’t sell good for a media piece then, again, I can’t worry about it.”

He added: “Combat and war and transition, as you know, it’s a very complex thing. For me, it’s not black and white.”

The operations are continuing during a troubling stretch for the Afghan security forces, as the Taliban are continuing to make gains. Members of the nation’s military and police forces were killed by the insurgents at a high rate last year. And in the first three months of this year, things already appeared worse: The casualty rate rose 54 percent over the same period last year, according to one Western and one Afghan official, who spoke on the condition of anonymity because the figures were not public.

The danger was highlighted in recent days in the northern province of Kunduz, where the Afghan Army has been forced to send thousands of reinforcements to beat back a major Taliban offensive. In addition to threatening to claim at least one district, the insurgents have come within a few miles of the provincial capital, officials in Kunduz said. Coalition forces deployed jets to the area in a show of force but no munitions were dropped, officials said.

In that environment, American military officials have been reluctant to let go of the war, arguing that their involvement remains necessary given the Taliban threat and changing regional factors.