Scooby Doo!
SD is on his collar.
SD
SD Gundam Force
I really don't have a clue sorrii :'(
The only one I know of is Megas XLR or maybe SD Gundam.
Skeeter Davis Sammy Davis, Jr
SD stamped on a ring could refer to the manufacturer's mark, indicating that the ring was made by a company or jeweler with the initials SD. It could also stand for "Sterling Silver," indicating that the ring is made from 92.5% pure silver.
14K is the content of gold in the item, and SD is most likely the initials of the ring's maker.
Cartoon network has aired most of the gundam series. GundamGundam 0080 & 0083G GundamGundam Wing i believe even 8th MS Team and SD Gundam
The only two that spring to mind for that era are: Skeeter Davis and the Australian -Slim Dusty.
Generally speaking, members of the Gestapo wore civilian clothing unless they needed the protection of a military uniform when working in operational areas. In that case, they wore an SS uniform in field-grey colour. Their rank was indicated by police-style shoulder straps, and by their SS-equivalent rank insignia worn on the right-hand collar patch. The left hand collar batch was plain. On the lower left sleeve, they wore a black diamond, outlined in silver thread, bearing the initials 'SD'.
The standard two letter abbreviation for the state of South Dakota is SD.