When the KPA crossed into South Korea on 25 June 1950, they advanced for Seoul, which was captured in less than a week. The lightly-armed Republic of Korea Army (ROKA) put forth futile resistance against the KPA, whereby their forces continued south toward the strategic port of Pusan. Within two days, the United States offered its assistance and the UN Security Council asked its members to help repel the attack under the auspices of the United Nations Command headed by the US. Australia promptly contributed No. 77 Squadron RAAF and the 3rd Battalion, Royal Australian Regiment (3 RAR), both of which were stationed in Japan under the British Commonwealth Occupation Force (BCOF).