The Secret Weapon of the IDF
All the nations of the world will see that G-d's Name is associated with you, and they will be in awe of you. (Devarim 28:10).
Menachot 35b interprets this verse as a reference to the tefillin worn on the head.
When the Gentiles see the Jews proudly attired in tefillin, they respect them. Tefillin cast an aura of fear over Israel's foes. Even demons and spirits will tremble in fright (Jerusalem Talmud, Berachot 5a).
The first letters of Shem Hashem Nikrah, "G-d's Name is associated," spell out the name of the letter SHiN. A Shin bolts out of either side of the head tefillin. It is the first letter of Sha-D-I. (Baal HaTurim).
"Tefillin are G-d's crown... Whoever dons this crown will become the ruler below, as G-d is the ruler above" (Zoher III 269b).
Similarly, Berachot 56a maintains that a person who sees tefillin in his dreams will soon rise to power. Berahot (6a) interprets "G-d's powerful arm" (Isaiah 62:8) as tefillin. "Tefillin grant power to Israel."
Accordingly, it has always been customary for Jewish soldiers to observe the mitzvah of tefillin with great care.
Text taken from Meam Loez on Ki Tavo p. 150. Photos collected from the Internet.