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A U.S. Air Force F-16 Fighting Falcon assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, taxis on the runway during exercise Thracian Viper 20 at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020.

A U.S. Air Force F-16 Fighting Falcon assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, taxis on the runway during exercise Thracian Viper 20 at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020. (Ericka A. Woolever/U.S. Air Force)

A U.S. Air Force F-16 Fighting Falcon assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, taxis on the runway during exercise Thracian Viper 20 at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020.

A U.S. Air Force F-16 Fighting Falcon assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, taxis on the runway during exercise Thracian Viper 20 at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020. (Ericka A. Woolever/U.S. Air Force)

A U.S. Air Force F-16 Fighting Falcon assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, flies over Graf Ignatievo Air Base, Bulgaria, during exercise Thracian Viper 20, Sept. 21, 2020.

A U.S. Air Force F-16 Fighting Falcon assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, flies over Graf Ignatievo Air Base, Bulgaria, during exercise Thracian Viper 20, Sept. 21, 2020. (Ericka A. Woolever/U.S. Air Force)

Two U.S. Air Force pilots from the 555th Fighter Squadron, Aviano Air Base, Italy, put on gear at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020. The pilots participated in Thracian Viper 20, a multilateral training exercise with the Bulgarian air force.

Two U.S. Air Force pilots from the 555th Fighter Squadron, Aviano Air Base, Italy, put on gear at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020. The pilots participated in Thracian Viper 20, a multilateral training exercise with the Bulgarian air force. (Ericka A. Woolever/U.S. Air Force)

Three U.S. Air Force pilots from the 555th Fighter Squadron, Aviano Air Base, Italy, walk toward their aircraft at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020. The pilots participated in Thracian Viper 20, a multilateral training exercise.

Three U.S. Air Force pilots from the 555th Fighter Squadron, Aviano Air Base, Italy, walk toward their aircraft at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020. The pilots participated in Thracian Viper 20, a multilateral training exercise. (Ericka A. Woolever/U.S. Air Force)

A U.S. Air Force pilot from the 555th Fighter Squadron, Aviano Air Base, Italy, performs a pre-flight check on an F-16 Fighting Falcon at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020, during exercise Thracian Viper 20.

A U.S. Air Force pilot from the 555th Fighter Squadron, Aviano Air Base, Italy, performs a pre-flight check on an F-16 Fighting Falcon at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020, during exercise Thracian Viper 20. (Ericka A. Woolever/U.S. Air Force)

A U.S. Air Force pilot from the 555th Fighter Squadron, Aviano Air Base, Italy, sits in the cockpit of an F-16 Fighting Falcon at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020.

A U.S. Air Force pilot from the 555th Fighter Squadron, Aviano Air Base, Italy, sits in the cockpit of an F-16 Fighting Falcon at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020. (Ericka A. Woolever/U.S. Air Force)

AVIANO AIR BASE, Italy — Airmen and F-16 Fighting Falcons from the 31st Fighter Wing and other U.S. units are wrapping up a weeklong exercise with the Bulgarian, Greek and Romanian air forces along NATO’s southern flank.

The drills in Bulgaria are the latest in a series of exercises taking place across Europe, where the Air Force has conducted numerous show-of-force flights stretching from the Baltic to the Black Sea. Some of the training has involved an Air Force bomber task force of B-52s, which are deployed in Europe to train with NATO allies.

The exercise at the Graf Ignatievo Air Base in central Bulgaria — dubbed Thracian Viper 20 — kicked off Sept. 18 and ends Friday. It was designed to demonstrate the units’ ability to work with and fight alongside Bulgaria and other allies, officials said.

About 150 airmen and six F-16s from the 555th Fighter Squadron, known as the Triple Nickel, took part in the exercise. Also participating are other units from Aviano Air Base, and airmen assigned to the 435th Air Ground Operations Wing, from the 86th Airlift Wing, at Ramstein Air Base in Germany.

During the exercise, the 555th Fighter Squadron conducted both air-to-air and air-to-ground training with other European partner nations, a 31st Fighter Wing statement said.

“The teams we have here on both the Bulgarian side and U.S. side, have been totally committed to the mission,” Air Force Lt. Col. Brian G. Lewis, the fighter squadron’s director of operations, said in a statement. “We are now launching Nickel jets and flying with our NATO partners, which is pretty cool to see.”

The U.S. has engaged in a series of exercises like Thracian Viper with Bulgaria since it joined NATO in 2004.

“The exercise is important because it gives us the opportunity to strengthen our relationship with Bulgaria and NATO,” Lewis said in a statement. “Additionally, we are learning how to take a limited amount of people to an unfamiliar location and conduct flying operations.”

llamas.norman@stripes.com Twitter: @normanllamas

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Norman covers the U.S. military in Northern Italy and sometimes elsewhere for Stars and Stripes. He was born in Guatemala and raised in Rhode Island. He has more than 10 years of experience as an Army photojournalist and has served as a photojournalism instructor at the Defense Information School.

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