U.S. defense giant Lockheed Martin, along with its partner MBDA Germany, hopes to sign a contract for the Medium Extended Air Defense System with Berlin this year, as Poland also is showing renewed interest in the technology, according to company officials. The German government selected the program for its lower-tier, air-defense investment, the Taktisches Luftverteidigungssystem, or TLVS, last year. Contract negotiations for the $4.5 billion deal to finish development and produce the systems have been ongoing since then. Germany's armed...