PORTSMOUTH — Entering the Virginia Port Authority’s three marine cargo terminals soon will involve a technology similar to the Smart Tag toll collection system. Officials say the new system will better secure the port. E ven with such improvements, many in the maritime industry think the nation’s 360 seaports remain unnecessarily vulnerable to attack because a national transportation worker identification card still has not been developed by the federal government, despite four years of efforts .When the entry system debuts in about a month at Portsmouth Marine Terminal, truck drivers will proceed to an unmanned entry gate. There they will...