On July 1, the US Far East Command directed the Eighth Army to assume responsibility for all logistical support of the US and UN forces in Korea, including the ROKA. Support for the American and South Korean armies came through the United States and Japan. The re-equipping of the ROK presented the UN forces with major logistical problems in July. The biggest challenge was a shortage of ammunition. Though logistics situations improved over time, ammunition was short for much of the war. Consumption of supplies differed among the various units and a lack of a previously drafted plan forced UN logisticians to create a system on the fly.