One of two double-ended helicopters still flying. Sea Knight is smaller than Chinook and has large sponsons just forward of the tail, tricycle landing gear, and side windows are four round portholes in rectangular frames.

The Sea Knight was the first replacement for the "Flying Banana" of the Korean War era, but the Army wanted a larger version and opted for the Chinook. The Sea Knight was and remains, after considerable upgrading and refitting, the U.S. Marines' standard medium-size assault helicopter. A few in Navy paint as cargo carriers; even fewer in civilian dress in the United States. Under license, Kawasaki manufactures a military version for Japan, and the only civilian models.