You may have probably received an answer by now but just in case, IDF/AF AH-1 Cobras were painted in FS30099 Brown up until 1982, post Lebanon War. During the war, they received the the yellow identification V that is presently on all IDF/AF helicopters (except for the Dolphin/Panther which served later). After the war, the Cobras (along with most of the other helicopters in the fleet) were repainted FS30145 Brown, which is a lighter shade. As for the FS30099 color itself, I believe it is a US standard, while the FS30145 is a locally produced paint.
As for a hobby paint match, this site lists most FS colors and hobby paint matches/mixes, as well as gives color samples;
http://ipmsstockholm.org/colorcharts/stuff_eng_colorcharts_fs.htm
HTH,
Albert