News and Press Releases


October 20, 2010

Wifredo A. Ferrer, United States Attorney for the Southern District of Florida, Anthony V. Mangione, Special Agent in Charge, U.S. Immigration and Customs Enforcement (ICE), Homeland Security Investigations, Miami Field Office, John F. Khin, Special Agent in Charge, Defense Criminal Investigative Service, and John Corbett, Special Agent in Charge, NASA Office of Inspector General, Office of Criminal Investigations, announced the sentencing of defendant Juwhan Yun, a/k/a Jw Yun on charges that he illegally imported rocket technology to South Korea. U.S. District Court Judge Kenneth A. Marra sentenced Yun to 57 months in prison, to be followed by 3 years of supervised release.

Yun had previously pled guilty on May 14, 2010 to knowingly and willfully engaging in the business of illegally brokering for the purchase and sale of defense articles to the Republic of Korea, without first having registered and obtained a license from the U.S. Department of State Directorate of Defense Trade Controls (DDTC), in violation of the Arms Export Control Act (AECA), 22 United States Code, Section 2778; and the International Trafficking in Arms Regulations (ITAR), 22 Code of Federal Regulations, Parts 120-130. Among the items he brokered were components for a 20mm gun known as the M61Vulcan, Russian Air Defense Systems and their parts and components, SU-27 Russian Fighter Aircraft and their parts and components, and RD-180 Propulsion Systems and related technology.

According to Court records, Yun was previously convicted of a conspiracy to export Sarin gas, in violation of the Arms Export Control Act, Title 22, United States Code, Section 2778 ,and was sentenced to 39 months in prison. As a result of this previous conviction, Yun was debarred by the Department of State, and was prohibited from engaging in any export or brokering activities involving defense articles.

Mr. Ferrer commended the investigative efforts of ICE’s Homeland Security Investigations in Ft. Lauderdale, the Defense Criminal Investigative Service, and NASA OIG, Office of Criminal Investigations. The case was prosecuted by Assistant U.S. Attorney Michael Walleisa.

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A copy of this press release may be found on the website of the United States Attorney's Office for the Southern District of Florida at Related court documents and information may be found on the website of the District Court for the Southern District of Florida at or on

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