[2] However, subordinate units of this command sometimes perform humanitarian missions in places such as Haiti, Cuba, and the Middle East.

When the United States entered World War II, the Hawaiian Department became subordinate to the Commander-in-Chief, Pacific Ocean Areas.

Throughout its history the command was designated: During the Korean War, USARPAC provided combat forces, training, and logistics.

After the war the Army cut its presence in the region as there was no longer a need for such a large number of combat forces in the Pacific.

USARPAC has sent forces on multiple humanitarian missions, disaster relief, and defense support of civil authorities.