Yes, Greece has a navy, and it was put into use during world war 2! (it was around before ww2 though!) The Hellenic Royal Navy in fact became the second-largest Allied Navy in the Mediterranean after the Royal Navy, accounting for 80% of all non-Royal Navy operations. One of the more notable boats from the HRN is the Adrias, a Hunt III class destroyer loaned to the greeks by Britain, and it was reported to sunk at least 2 german U-Boats during its time. (decent picture would be cool, i'll try and scan one in soon)