Coast Guard ship on Jeju Island - why?

Jeju Island, South Korea as a US Coast Guard ship recently arrived at the new Navy base in Gangjeong village.

This is a clear sign of US arrogance and how they view South Korea as 'Pentagon turf' by sending a Coast Guard ship that far from home to Jeju Island.

From Sung-Hee Choi in Gangjeong:

US Coast Guard ship, Bertholf, Out of Jeju!

Don't cut the trees in the Bijarim-ro!

United States should make an apology for the Jeju April 3rd!

It is the time, especially for the remembrance of April 3rd uprising and massacre (March 18 to April 7). And it is annoying that a USCG Bertholf came to Gangjeong while innumerable trees are cut for the expansion of a road named Bijarim-ro for the planned air force base (2nd Jeju airport) in Seonsan during this period. United States should first make an apology for the Jeju April 3rd massacre 71 years ago!

Gangjeong, Bijarim-ro, and April 3rd together.