Sikorsky CH-124 Sea King
The Sikorsky CH-124 Sea King is a twin-engined anti-submarine warfare ( ASW ) helicopter designed for shipboard use by Canadian naval forces , based on the US Navy's SH-3 . 
<triplet> Sikorsky CH-124 Sea King <subj> anti-submarine warfare <obj> use <triplet> SH-3 <subj> helicopter <obj> subclass of