The Shin Meiwa PS-1 and US-1A are large STOL aircraft designed for anti-submarine warfare (ASW) and air-sea rescue (SAR) work respectively by Japanese aircraft manufacturer Shin Meiwa. The PS-1 anti-submarine warfare (ASW) variant is a flying boat which carried its own beaching gear on board, while the search-and-rescue (SAR) orientated US-1A is a true amphibian.
The PS-1 is a strictly water-based Anti-Submarine Warfare (ASW) flying boat. The SS-2 is its land-and-water Search and Rescue (SAR) derivative.