KABUL, Afghanistan — An insurgent rocket attack damaged the plane of the top U.S. general as it sat parked at a coalition base in Afghanistan on Tuesday, another blow to the image of progress in building a stable country as foreign forces try to wind down the 10-year-old war.

The Taliban claimed responsibility for the two rockets that landed near the C-17 transport plane that U.S. Army Gen. Martin Dempsey, the chairman of the Joint Chiefs of Staff, flew into Bagram Air Field north of Kabul on a day earlier. The claim was an attempt by the insurgents to score more propaganda points in what has been a deadly few weeks for the international coalition in Afghanistan.

Jamie Graybeal, a spokesman for the U.S. military and the international coalition, said Dempsey was in his staff quarters when the two rockets landed, and was not hurt in the attack. Two aircraft maintenance workers were lightly wounded by shrapnel, and a nearby helicopter was damaged, Graybeal said.

Such turncoat attacks – which the Taliban also said they are behind – killed 10 Americans in the last two weeks alone, threatening morale and raising questions about the strategy to train Afghan security forces so they can fight the insurgency after foreign troops end their combat role in 2014.