(CNN) Thirteen Marines have been formally charged with involvement in human smuggling operations, the US Marine Corps announced Friday.

The Marines will face military court proceedings for alleged violations of the Uniform Code of Military Justice, including failure to obey an order, drunkenness, larceny, perjury and transporting and/or conspiring to transport undocumented immigrants.

"Two of the Marines, Lance Cpl. Byron D. Law and Lance Cpl. David J. Salazar-Quintero, both members of 1st Battalion, 5th Marine Regiment, 1st Marine Division ... were arrested by border patrol personnel on July 3, 2019 for allegedly transporting and conspiring to transport undocumented immigrants," the 1st Marine Division Press Office wrote in a statement.

In July, 18 US Marines and a sailor were arrested in dramatic fashion for alleged involvement in various illegal activities ranging from human smuggling to drug-related offenses, according to a statement made to CNN from the Naval Criminal Investigative Services.

A US official told CNN at the time that the arrests were related to an incident this summer in which two Marines from Camp Pendleton were charged with transporting undocumented Mexican immigrants to the United States for financial gain.

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