I suppose you are talking about East
German T-72s as West Germany had this tracked thingy called the Leopard 1 and 2.
East German T-72s were painted in chlorbunagrün SM which was not standardised in the RAL system and also tended to weather pretty quickly, but apparently RAL 6003 is a pretty close match. Be aware that it is a semi-gloss paint, Revell 361 and Modelmaster medium green 1713E have both been cited as good matches by former crewmen and modelers.
None of the T-72s entered the inventory of the Bundeswehr and most of them were scrapped. If it is important, only a very few of the T-72s were Soviet-built, most of them came from Czechoslovakia.
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1/87er, die feinmotorisch flinke Elite des Modellbaus.