A person can serve in army and be a good citizen-- it does not make him a Jew though. A quicky ritual procedure does not make him a Jew either. For those who does not know this, for a conversion to be Halachically valid, one has to study Judaism and become Torah observant.
Iran's Khamenei bans all further negotiations with U.S. (Reuters)
from the article: IDF conversion bill passes preliminary reading in Knesset