Another of my favorite Greek military flags:
This was the flag of the I Army Corps (Greek: Α' Σώμα Στρατού, abbr. Α' ΣΣ)vof the Hellenic Army, founded in December 1913. Unfortunately it has been disbanded now.
The flag reads Μολών Λαβέ, which translates to "Come and take them". Go watch 300 or read some history if it doesn't ring a bell.
Photo credit and flag history: https://en.wikipedia.org/wiki/I_Army_Corps_(Greece)
What's your favorite flag? Let me know in the comments!