Admiral Timothy Keating, US commander-in-chief for the Pacific theater, is scheduled to hold three days of meetings with Cambodian officials to strengthen military ties between the two countries.
Keating took over as commander of the theater in March. Cambodia has steadily received training other benefits from the US military since January.
Keating's visit comes on the heals of an official trip by Vietnam's chief military commander, Gen. Le Manh, last week.
US Embassy spokesman Jeff Daigle said the visit underscored the importance of the role of the US military in relations with Cambodia.