Israel and Greece have signed their largest-ever defense procurement deal, Israel's Defense Ministry said on Sunday. As part of the deal, Israel's Elbit Systems Ltd. will operate a training center for the Greek air force under a contract worth about $1.65 billion, the ministry said. Elbit said it will supply new M-346 training aircraft and maintain the the Greek air force's entire training fleet, comprising dozens of M-346 and T-6 aircraft, for a period of approximately 20 years.