A contingent of around 20 special operations and conventional forces has been conducting the training for less than a year, the official, who declined to be identified, told AFP, adding that some of the trainers rotate in and out.
The official largely confirmed a Wall Street Journal report which said the training has been going on for at least a year, amid
China's rising verbal threats against the island ally of the
United States.
Taiwan's Defence Ministry declined to comment on the report, but Pentagon spokesman John Supple said that generally speaking, US support for Taiwan's military is gauged on its defence needs.
"Our support for and defence relationship with Taiwan remains aligned against the current threat posed by the People’s Republic of China," Supple said in a statement.
"We urge Beijing to honour its commitment to the peaceful resolution of cross-Strait differences."
Taiwan media reported last November, citing Taiwan's Naval Command, that US troops had arrived there to train Taiwan marines and special forces in small-boat and amphibious operations.
But those reports were subsequently denied by US and Taiwanese officials, who emphasised the two sides are only involved in bilateral military exchanges and cooperation.
The United States supplies weapons to Taiwan, including missiles for defence and fighter jets, amid Beijing's threat to forcibly retake control of the island and reintegrate it with China.
The US also maintains an ambiguous commitment to defend Taiwan, which Beijing considers a renegade province.
A video released last year and featured in Taiwan media showed US troops taking part in an exercise on the island dubbed "Balance Tamper."
Chinese forces have stepped up their activities toward Taiwan in the past year, conducting sea assault exercises and flying large sorties of bombers and fighters close to Taiwan airspace.
