being be followed by four of the improved s. Besides the efforts made in the Overseas wars, during this period the Navy was able to continue to guarantee the Portuguese naval commitments to the NATO missions in the North Atlantic. To be able to continue to support these missions, the Portuguese Navy built three anti-submarine frigates and acquired four s. As part of the commitments to NATO, the Portuguese Navy supports the installation of the COMIBERLANT in Lisbon and deploy the Almirante Pereira da Silva-class frigates to regularly participate in the STANAVFORLANT since its creation. Decolonization and late Cold War On the early morning of 25 April 1974, young officers of the Portuguese Armed Forces triggered the almost bloodless Carnation Revolution, which overthrew the Salazar regime. Incidentally, the STANAVFORTLAND was in the Tagus and leaving it on the day of the Revolution, integrating the Portuguese frigate Almirante Gago Coutinho. When was already leaving the Tagus with the other NATO ships, Almirante Gago Coutinho was ordered by the Portuguese Navy Staff to leave the international formation, to turn back and to place itself in front of the Terreiro do Paço riverside square, where most of the revolutionary forces were concentrated. When already positioned in front of the square, the frigate was ordered to open fire against the armored vehicles of the revolutionary forces, but its crew refused. The new regime quickly negotiated ceasefires with the insurgents in Angola, Mozambique and Guinea, ending the Overseas wars. This is followed by the independence of the Portuguese African territories, the first one being Guinea-Bissau (ex-Portuguese Guinea) on 10 September 1974 and the last one being Angola on 11 November 1975. Most of the Portuguese small naval units based in those territories were transferred for the new countries. The Navy supported the withdrawal of many thousands of Portuguese troops and civilians from Africa, transporting them back to Portugal. On the day of the independence of Angola, the task force FO 15 – that included the frigates Hermenegildo Capelo and Roberto Ivens, the corvette General Pereira d'Eça and the tanker São Gabriel, together with the hospital-ship and the troop transport ships Niassa and Uige – execute the last of these operations in the bay of Luanda, embarking on board Vice-Admiral Leonel Cardoso, the last Portuguese governor, and a military detachment and then sailing to Lisbon. Follow the Carnation Revolution, the Portuguese authorities also start the preparations