From AP:
The United States may post Marines at its unofficial embassy in Taiwan — a small but symbolically significant change in its delicate political relationship with the self-ruled island.
A State Department advertisement in the English-language Taipei Times newspaper called for contractors to construct quarters for Marine security guards at a new U.S. compound in the capital, Taipei.
Since the U.S. switched its recognition from Taipei to Beijing in 1979, there have been no marine guards at its Taipei facility — the American Institute in Taiwan — in keeping with its deliberately low political profile.
Read also Washington may post Marines at its office in Taiwan from Taipei Times.