On July 27, 2003, the Oakwood mutiny was staged by a group of about 300 armed defectors from the Armed Forces of the Philippines (AFP) and the Philippine National Police (PNP) led by Army Capt. Gerardo Gambala and Navy Lt. Senior Grade Antonio Trillanes IV against the Arroyo administration. The group forcibly seized and occupied Oakwood Premier in Glorietta, Makati for almost 20 hours. They expressed grievances against the government's supervision of the military, and demanded the resignation of Defense Secretary Angelo Reyes, PNP Director General Hermogenes Ebdane, and AFP Chief of Intelligence Service Victor Corpus; They also aired their grievances against the military establishment and anomalies on the AFP. The mutiny was covered heavily by the local press, who dubbed the group as "Magdalo" in reference to their insignia, which alludes to the Magdalo faction during the Philippine Revolution, despite the group officially calling themselves "Bagong Katipuneros". The mutiny ended after the government successfully negotiated with the group. Several prominent participants of the mutiny, including Trillanes and Gambala, were later charged.

The Armed Forces of the Philippines (AFP) are the military forces of the Philippines. It consists of three main service branches; the Army, the Air Force, and the Navy. The President of the Philippines is the Commander-in-Chief of the AFP and forms military policy with the Department of National Defense, an executive department acting as the principal organ by which military policy is carried out, while the Chief of Staff of the Armed Forces of the Philippines serves as the overall commander and the highest-ranking officer in the AFP.