The chairman of the US joint chiefs of staff arrived in Kabul Monday as the NATO-led coalition has suffered a spate of attacks by Afghan soldiers and police, reported dpa.
General Martin Dempsey is expected to meet with NATO Afghanistan commander John Allen and other senior military officials, coalition spokesman Jamie Graybeal said.
"He will talk about insider attacks as well, among other issues, but he is basically here to talk with the officials about the progress about the (military) campaign," Graybeal said.
He was also expected to meet Afghan officials but details were not available.
Two Afghan policemen shot at US troops in Kandahar province on Sunday, killing one, officials said.
The incident took place in Spin Boldak district near the Pakistan border. One of the shooters escaped, officials said.
At least 10 US troops have been killed in such attacks in the past two weeks. There have been 32 attacks and 40 deaths since January.
The attacks have strained relations between the alliance and their Afghan partners.
Taliban leader Mullah Omar on Friday said the insurgency had successfully infiltrated Afghan security forces and urged more of its members "to display the same boldness and spirit" as those who had attacked US troops.
A Western military official told dpa on Friday that the increasing number of attacks has prompted NATO to require that its soldiers carry loaded weapons at all times, even inside their bases.
US Defence Secretary Leon Panetta on Saturday urged Afghan President Hamid Karzai to work closely with General Allen on counterintelligence efforts and rigorous vetting of Afghan recruits.