World War II After graduation, he assigned as a 3rd Lieutenant to the Philippine Commonwealth Army. Nineteen months later, he volunteered to the newly formed Offshore Patrol unit of the Army and promoted as a 2nd Lieutenant with the OSP – Sea duty forces. A few weeks after the Japanese attack on Pearl Harbor, he was promoted as a 1st Lieutenant after he was inducted into the
U.S. Army Forces in the Far East (USAFFE). He was the Commanding Officer of the
Q-112 Abra, a 55 ft stepped-hull torpedo boat with aftward launch torpedo chutes built for the Philippine Commonwealth Government by the British shipbuilding firm
John I. Thornycroft & Company – one of three "Q-boat" torpedo boats used by the Offshore Patrol (OSP) during the war. For their actions, he was immediately promoted to Captain by
General MacArthur in Corregidor and awarded the
Silver Star for heroism and gallantry in action. On April 10, 1942, to prevent their boat capture by the Japanese, Captain Alcaraz's
Q-112 Abra was scuttled at night near the shore of
Paombong coast, four miles off Bataan's east coast. He and his crew floated to shore using bamboo poles but were spotted by two search lights from Japanese patrol boats. Alcaraz was released on August 10, 1942 after undergoing an intensive four-month "rejuvenation program". He was paroled and instructed to be re-trained to join the Bureau of Constabulary at the Torres High School in
Gagalangin, Tondo. In September 1942, he graduated as a police officer and was told that his first assignment was at
Lanao del Norte province in
Mindanao. Alcaraz faked that he had malaria and was confined to a hospital in San Lazaro. This ensured that he would miss his transport ship to Mindanao, so he was then reassigned to
Bayombong, Nueva Vizcaya. After the end of the war and of his ordeal as a POW, Alcaraz rejoined the OSP. After the Philippines was given its independence from United States, all remaining OSP officers became the pioneering nucleus of the organizational structure of the Philippine Naval Patrol which later renamed into the Philippine Navy.
Korean War service As Lieutenant (Senior Grade) and later Commander, Alcaraz also held significant naval commands during the Korean War, including being squadron skipper of one of the teems that regularly transported the Battalion Combat Teams of the Philippine Expeditionary Force to Korea (PEFTOK) to wherever they needed to go.
Command of the Naval Operations Force against Smuggling In 1964 president
Diosdado Macapagal placed Alcaraz in command of the Naval Operations Force (NOF) he had created to combat smuggling, particularly of foreign cigarettes. After some initial frustrations, Alcaraz proved highly effective at the job, seizing about P750,000 worth of smuggled cigarettes each month in 1965 and getting him promoted to the naval rank of Commodore. == Conflict with President Ferdinand Marcos and separation from service ==