You might not have a decal on your car to tell the world about your Navy service much longer, but active and retired chiefs in at least one state have an alternative option — one open only to them. South Carolina began issuing chiefs-only license plates (that’s one on the right) earlier this month, according to a news release issued by the Patriots Point Foundation, the fundraising group behind the Charleston Harbor-based museum that includes the decommissioned aircraft carrier Yorktown. The plate costs $60 and has been endorsed by the South Carolina-based chiefs’ messes at Nuclear Power Training Unit Charleston…