There is no comparison between Tzahal and Coca Cola. While coke is an advertisement looking to sell a product, Tzahal is an organization looking to buy souls.
The existence of Tzahal is best described as a paradox. Yes, they are protecting the Jewish state yet as time goes on they expend much energy on making it less Jewish.
Tzahal has been very successful both in defending Israel and in spreading their zionist propaganda among us.