transport dock vessel – locally known has Navio Polivalente Logístico (NPL) 1 landing platform - to operate unmanned aerial vehicles and unmanned underwater vehicles; 1 replenishment oiler – to replace Berrio-class fleet tanker 6 s Aircraft The Navy only has rotary assets, there has been no fixed-wing air support since 1952 when the Curtiss SB2C Helldiver fighters were in use. Only the largest of the Portuguese Navy's vessels are capable to support aviation: two frigates classes (Bartolomeu Dias class and Vasco da Gama class), four patrol vessels (Viana do Castelo class), the largest corvette class (Baptista de Andrade class) and a tanker (Bérrio class). Unmanned aerial vehicles (UAVs) 4 × UAVision Spyro (Açor-class); 2 × UAVision OGASSA OGS42; ? × Tekever AR4; ? × Tekever AR3. ? × Target drone X-1001. Unmanned surface vehicles (USVs) 1 × Sistema Marítimo Autónomo Hidrográfico X-2601; 1 × Sistema Marítimo Autónomo X-2701; 1 × Sistema Marítimo Autónomo X-2801; Ranks and insignia Officers Ratings See also List of ships of the Portuguese Navy Military history of Portugal Fuzileiros, Portuguese Marine Corps Special Actions Detachment, naval special operations unit Sapper Divers Group, combat divers unit. Portuguese Naval Aviation Maritime Museum of Lisbon Academia de Marinha Ship prefix Pennant number Notes References Source and bibliography Garcia de Resende, Vida e feitos d' el-rey Dom João Segundo, 1545 External links Military of Portugal