USS Thach
DECOMMISSIONED - November 01, 2013
USS Boone, USS Thach Conduct Exercises with Chilean Sub
By Mass Communication Specialist 1st Class (SW) Steve Smith Southern Seas 2011 Public Affairs
USS BOONE, At Sea – Guided-missile frigates USS Boone (FFG 28) and USS Thach (FFG 43) completed a series of exercises the with Chilean navy submarine Carrera (SS-22), June 10.

During the four-day passing exercise (PASSEX), ships from both navies trained with each other in a series of anti-submarine warfare (ASW) and surface warfare (SUW) exercises to promote communications, interoperability and partnership.

“We typically hold a PASSEX when operating with ships of different nations for the purpose of training,” said Sonar Technician (geographic) Chief (SW/AW) Dallas Brown. “The focus of this PASSEX was to provide excellent training opportunities in ASW for the sailors aboard Boone and Thach while providing surface warfare (SUW) training for Chilean submariners.”

The exercises included unit-level training in submarine familiarization, passive and active tracking, coordinated tracking exercises and coordinated tactical exercises.

“It was important for Boone to work with an asset, the Chilean sub, which we do not get to see often,” said Ensign Loney Cason, Boone’s anti-submarine warfare officer. “It was great to track a sub in real-time, which helps train sonar technicians, operational watch standers and lookouts.”

This series of exercises also focused on coordination and effectiveness of tracking and hunting submarine threats.

“The primary goal during the PASSEX was to learn as much as possible from our Chilean counterparts,” said Lt. John Hoy, Boone’s combat systems officer.

Boone and Thach participated by leading the coordinated ASW exercises and alternately serving as the search and attack unit commander.

“One of our missions during Southern Seas 2011 is Theater Security Cooperation,” said Hoy. “We are learning the fundamentals of how other navies function, and learning how to work with them in a tactical environment and beyond.”

U.S. Naval Forces Southern Command/U.S. FOURTH Fleet (COMUSNAVSO/C4F) supports U.S. Southern Command joint and combined full-spectrum military operations by providing principally sea-based, forward presence to ensure freedom of maneuver in the maritime domain, to foster and sustain cooperative relationships with international partners and to fully exploit the sea as maneuver space in order to enhance regional security and promote peace, stability, and prosperity in the Caribbean, Central and South American regions.

For more information, please contact COMUSNAVSO/C4F Public Affairs by e-mail at, visit, on Facebook at or, or on Twitter at
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