The Rocket Launcher is unlocked in Resident Evil Survivor after beating the game with an S rank, and comes with infinite ammunition. Even though this weapon generally kills most enemies with one shot, occasionally, if the rocket is launched at longer ranges, certain enemies like the T-103s or Hypnos-T Type (especially its later mutations) may block the rocket with their arms/claw but since the weapon is quickly reloaded and possesses infinite ammo, chances are they won't be blocking its attacks for long.