Three U.S. Navy ships arrived Friday - as welcome guests - at the Vietnamese port of Da Nang.
The visit is part of a seven-day celebration of the 16th anniversary of the establishment of diplomatic relations between the two former enemies, the Navy said in a press release.
The 7th Fleet delegation consists of the guided-missile destroyers USS Chung-Hoon and USS Preble, the rescue and salvage ship USNS Safeguard, additional sailors from the Logistics Group Western Pacific command, and a mobile diving and salvage team.
The Safeguard underwent repairs at a Vietnamese shipyard in 2009, the Navy said.
Territorial tensions have risen in recent weeks between Vietnam and China over the South China Sea, but the U.S. says the visit is a planned training mission focusing on "non-combatant events and skills exchanges in areas such as navigation and maintenance."