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If you don't know how to add sources (which you really need to do in the article, just clumping some up at the bottom doesn't always make the cut), read this article - WP:CITE#HOW
The writing style itself isn't very fluid. You keep repeating information which has already been said before. For some pointers on how to patch all of this up, read this article - Wikipedia:Your first article
Do not use abbreviated terminology without giving the full name of the organization/person/whatever beforehand. Instead of simply saying "he joined the IDF", you should say "he joined the Israel Defence Forces (IDF)." The latter format means that you can just use 'IDF' whenever you want to refer to the Israel Defence Forces again, without having to spell the whole thing out. However, bear in mind that some parties such as the Royal Navy cannot be shortened to a few letters such as 'RN'. You should always write out these groups in full.
When providing wiki-links, check before whether the page exists and/or how you can make the link more direct. Instead of putting something like the "U.S." for example, say instead "United States" so the link doesn't have to have a small re-directed caption. (makes your article and Wikipedia look more professional)