Demonstration and Shakedown Operation

A Demonstration and Shakedown Operation (DASO) is a series of missile tests conducted by the United States Navy and the Royal Navy.

A shakedown operation usually occurs after a refueling and overhaul process or construction of a new submarine.

Testing of missile systems allows collection of flight-data, and examinations of submarine launch platforms.

[2] The first DASO test occurred July 20, 1960 on the USS George Washington, using the Polaris A-1.

Modern tests use the UGM-133 Trident II, launching from an Ohio-class submarine.