Greg Rucka 
Old Guard Book One: Opening Fire [PDF ebook] 

Collecting the critically acclaimed miniseries by GREG RUCKA and LEANDRO FERNANDEZ. Old soldiers never dieand some of them don It even fade away. Cursed with immortality, Andromache of Scythia and her comrades-in-arms ply their trade for those who can findand affordtheir services. But in the 21st century, being immortal is a difficult secret to keep, and when you live long enough, you learn that there are many fates far worse than death. Collects THE OLD GUARD #1-5