The High Survivability Test Vehicle (Lightweight) (HSTV(L)) was a U.S. Army light tank manufactured by AAI Corporation.

[1] In early 1977 the Army selected proposals from AAI and Pacific Car and Foundry for HSTV(L) concept feasibility analysis.

[3] Martin Marietta expressed interest in a joint venture with the AAI Corporation to enter a version of the HSTV-L into the U.S. Army's Armored Gun System competition.

The corporation apparently decided that the technology was not sufficiently advanced to proceed with radical changes in the HSTV-L to meet the new AGS requirements, therefore, they did not bid on the program.

[6][7] The main armament consisted of an Ares Incorporated XM274 75 mm CTA autocannon with 2-axis stabilization[5] capable of firing Armour-piercing fin-stabilized discarding sabot and high-explosive.

[6] Unlike the Pacific Car and Foundry proposal all rounds were accessible to the autoloader and there was no secondary ammunition storage.