BAP Almirante Grau is the third out of four Carvajal-class frigates ordered by the Peruvian Navy in 1973 and originally named Montero. It was built by SIMA at Callao under license from the Italian shipbuilder Cantieri Navali Riuniti. As such, it was the first modern warship built in Peru. In late 2007 its flight deck was extended to allow ASH-3D Sea King helicopters to land and refuel, although they cannot be housed in the ship's hangar.