http://www.medals.org.uk/greece/greece017.htm shows the Medal of Military Merit (1917). The Medal for Outstanding Acts - http://www.medals.org.uk/greece/greece018.htm - was introduced in 1940, originally using the 4th class of the Medal of Military Merit, but later getting its own design. Then in 1950 it was replaced by the Distinguished Conduct Medal - http://www.medals.org.uk/greece/greece016.htm - which is the one with red rather than black stripes on a yellow ribbon. That's still awarded, with appropriate design changes post-1974. Apologies for all the links, I'm at work so do not have the images to upload!