PT-76 remains to be one of the main battle combatants of Vietnam Armored Arms, as well as spearhead in beach-landing for the Naval Infantry. Its main advantages are lightweight and fully amphibious with formidable firepower against enemy structures. However, the PT-76 is getting old and could not fulfill modern combat conditions. Therefore, the needs to upgrade and replace the PT-76 is getting more necessary over time. Is it possible to replace the PT-76 with something like Sprut-SD?