Our History

Established in 2005 and headquartered in Milwaukee, Wisconsin, S3 AeroDefense serves the military and commercial aerospace market with supply chain management and component repair solutions.

Cool Timeline


Founded in 2005 by Jeff Wnuk, Aksel Sidem and Sebastien Imbert, S3 AeroDefense began as S3 International with the intent to provide innovative, cost effective Spares, Repairs Services and Solutions to become One Stop Shop to the Commercial and Military aircraft operators around the world.


The Leadership Team has taken the company from a basement operation to a Worldwide reputable supplier of spare parts and services to the aerospace aftermarket. S3 International has had great success and many accomplishments in its short life, including its selection as the 2010 small business exporter of the year…Read More


By 2011, S3 had formed and added its FAA & EASA approved Repair Station, offering a broad scope of in-house repair capabilities enlarging its portfolio of services.


In 2016, S3 has been nominated to receive the prestigious “E” Awards presented by the U.S Secretary of Commerce recognizing S3significant contribution to the U.S Exports.


The Original founder believed that continued growth would come by adding expertise, value added services and inventory and have decided to form strategic Partnership, in 2018, with Dermond Aerospace, led by the Dermond Brother’s, Eric, Max and Stephane, the original Founders of Derco Aerospace and Pioneers of the Military Aftermarket.


In 2020, S3 is Celebrating its 15th year of success and the Executive Leadership have decided to rename S3 International to S3 AeroDefense. As a Global Leader in the defense Aftermarket the new name emphasizes our long-term vision to continue to be a trusted Partner in the Aerospace and Defense…Read More