UPDATE 1-State Department OKs possible helicopter sale, upgrade to South Korea

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Adds additional sale details in paragraphs 1 and 2

- The U.S. State Department on Monday said it had approved a possible $3 billion deal to sell helicopters to South Korea and a potential $1.2 billion upgrade program.

Lockheed Martin LMT.N is the principal contractor for the sale that would include 24 MH-60R multi-mission helicopters, according to the statement.

Boeing BA.N is the principal contractor for the upgrade program that would include radar electronic units and radios, among other equipment.