The T3 Light Tank was an attempt to get a lighter vehicle in order to fit the new US classification for light tanks.
United States of America (WW2) - Tank Encyclopedia
T3-Bh Heavy Attack Tank, Star Wars: Exodus Visual Encyclopedia
WW2 US Medium Tanks Archives - Tank Encyclopedia
Christie M1931 - Wikipedia
Sturmgeschütz III Ausf.G - Tank Encyclopedia
WW2 French Light Tanks Archives - Tank Encyclopedia
Cold War US Light Tank Prototypes Archives - Tank Encyclopedia
Has Own Video Archives - Page 21 of 32 - Tank Encyclopedia
Light Tank T3 - Tank Encyclopedia
L3/33 - Wikipedia
Has Own Video Archives - Page 21 of 32 - Tank Encyclopedia
WW2 US Light Tank Prototypes Archives - Tank Encyclopedia
WW2 US Medium Tanks Archives - Tank Encyclopedia