What little Tallarn fluff knowledge I have, I posted in your previous
In terms of fluff, I think Cadians would be more similar than Tallarn. The entire Cadian population is conscripted into the military. The entire planet is always on alert for attack, since there are powerful enemies right on their doorstep. Israeli uniforms also look like modern fatigues and body armor, not desert tribesmen.
I guess my question would be... what do you see as the distinctive characteristics of the Israeli army? If I were building a force like this I might focus on Veteran Squads and tanks. I'd even build Leman Russes that have the distinctive ball-and-chain shot deflectors found on the turret bustle Merkava tanks.