In early Red Alert 2 screenshots the Allies did not use the Grizzly tank and used a different tank with a similar appareance to the Tank Destroyer. It appears to be a medium tank, unable to rotate its turret. The tank doesn't seem to have any anti-infantry capability and is not available in the game data files anymore. As seen in the screenshot it could also resemble some kind of artillery. As a tank it was probably supplemented by the also cut Light tank, which still can be found in the game data. The role of Allied artillery in the final version was taken up by the Prism Tank.
Allied Third World War Arsenal 
Tanks 