US plans for Guam missile base seen as countering strength of China
Countering the North Korea missile threat is the stated objective, but many see the move as being more directed at the strength of China

The US is planning to station anti-ballistic-missile systems on the Pacific island of Guam, a move ostensibly to defend against unpredictable North Korea, but which analysts say may be intended to counter China.
Within Washington's defence plans for next year are provisions for siting terminal high-altitude area defence (Thaad) systems on the island territory, combined with the broader realignment of US forces in the Asia-Pacific region.

The report on the defence planning states that: "The committee recognises the strategic importance of providing ballistic missile defence for Guam and the current US asset based there.
"The committee further recognises that as part of bilateral negotiations with the government of Japan, the US military presence on the island and the need to protect it from missile threat are projected to increase."
Thaad systems and Patriot interceptor missiles have been stationed on Guam in the past, supplementing warships, but the report cites the "immediate threat of missiles launches from the Democratic People's Republic of Korea toward US military assets on Guam" as reason for the move.