the Lockheed Martin P-3 Orion was designed to perform Anti-Submarine Warfare (ASW) and Anti-surface Warfare (ASuW) missions for the US Navy. The most capable variant of the Orion is the P-3C ...

US Navy's Poseidons being upgraded to Block 2 ... The P-8 Poseidon replaces the aging P-3 Orion. The P-3 Orion is based on the aging turboprop Lockheed L-188 Electra first developed in the 1950s.