Cuba begins research into improved light tanks, better artillery and more maneuverable airframes.
dddddddddddddone
research the final experimental and artillery tiers in 1938
light tank upgrades have been completed sooner than expected
OLD:

Weight: 8 tons
Armor: front-22mm sides/rear-9mm
Engine: 175 kW
HP/Ton: 22
Armament: 1 20mm autocannon, 2 6.5mm MGs
Crew (5): radio-commander, gunner/loader, machinegunner, machinegunner, driver
NEW:

Weight: 13.1 tonnes
Armor: front-36mm sides-18mm rear-13mm
Engine: 187 kW
HP/Ton: 19
Armament: 1x 37mm short cannon, 2x 6.5mm MGs, 1x 14mm MG
Crew (5-6): commander, gunner-loader, radio-machinegunner, machinegunner, driver, (external) machinegunner
changes not mentioned in the stats:
driver now has a periscope instead of a view port
tracks are both 6mm wider
most of cuba's armor is recalled to the factories for upgrades
also, infantry has started calling them Grandes, meaning, well, big, or great, based off of the fact that they weigh several tonnes.