North American NA-50 "Torito"
While the AT6/SNJ Harvard/Texan is iconic as "the" WWII trainer, North American had designed a light fighter-bomber version as the NA-50.
From the origial NA-16 trainer, the NA-44 was designed as a low cost combat aircraft. A sales tour of South America led to an order of 7 aircraft being made by Peru - other countries also placed orders, but those were filled by more updated versions.
The aircraft that were built for Peru were designated the NA-50, and without a name from North American they were called "Little Bulls" by the Peruvians. The aircraft arrived in Peru in early 1939 and were the first retractible undercarriage aircaft in military service there. One aircraft was lost early in an aerobatics accident, and with the Ecuadorian-Peruvian War of 1941 another aircraft was lost in combat. In combat the Toritos wore individualised nose cowling colours for easy identification, as was the Peruvian style of the time.
By 1947 they were replaced in frontline service by Curtis P-36 Hawks, and the surviving aircraft were transferred to training duties until 1950 when they were decommissioned.
In 1954 a single flyable aircraft was assembled from the mothballed hulks, and this aircraft was used as an Air Force display machine until damaged in 1961. It was again rebuilt, but now is mounted on a plinth, painted as the aircraft lost in combat in 1941.
Corrected pilot name, thanks @reytuerto