This blog (by Zeev Barkan) is dedicated to the Star of David, its history, its various meanings and usages in different cultures. It includes thousands of pictures of Star of David, six-pointed stars, hexagrams, Solomon's Seals, Magen Davids and yellow badges,and served as a resource for three books and four art exhibitions.
From Hayim Shtayer collection. Militaristic style poster that appeared, so it seems, before the 1973 War. We see many IDF emblems along with portraits of Herzl (on the yellow background of a large Star of David), Golda Meir, Zalman Shazar, Moshe Dayan and Hayim Bar Lev. This Militaristic Trend died in the 1973 War, but I see even today similar posters here and there used for decorating the Sukkah.
Dan Feldman sent to me a photo of a postage stamp with six-pointed star in the center of an impossible triangle created by Oscar Reutersvard (born in 1915 in Stockholm). 
Copyright: Sabina Saad 2008.
The international symbol of man is a circle with an arrow; it is the ancient Roman symbol of Mars, lord of war (his shield and spear). It is also the symbol of iron. The international symbol of women is a circle with a cross; it is the ancient Roman symbol of Venus (Goddess of Love), of the brightest planet after the moon, and of copper.
I supposed that it is not a coincidence that Sabina used the SHIELD of Mars as a basis for David’s SHIELD. For Jews the six-pointed star was, and still is, a symbol for their being protected by God; for Romans it probably had the same meaning, but the SHIELD was protecting their God.
