[1] When the Pacific War broke out in 1941, Nakar was then a captain in the 71st Infantry Regiment of the United States Army Forces in the Far East (USAFFE).

His theater of operations included Cagayan, Isabela, Nueva Vizcaya and Pangasinan, where his unit managed to launch a raid on Dagupan.

After communications with the Philippines were lost following the Fall of Bataan in April and that of Corregidor in May, Nakar was able to transmit a radio message to General Douglas MacArthur's headquarters in Australia in June 1942 that confirmed the formation of an armed resistance movement in the country.

[1] Nakar also published one of the first publications issued by the guerrilla movement, Matang Lawin (Hawk's Eye), which came out in mimeograph form from June to September 1942.

[4] He was taken to the main Japanese garrison in Manila at Fort Santiago and was tortured there for several months in an effort to convince him to change his allegiance to Japan.