To save lives, Ukrainian combat medics must stay alive. So, deep inside a position that soldiers call “the black forest” in eastern Ukraine, the medical corps of the 63rd Mechanized Brigade tries to remain hidden. The zero line — where Russian and Ukrainian forces are squared off in trench lines within sight of each other — is only a mile or two away. The iconic red cross painted on the side of the team’s armored vehicle offers little protection from enemy fire. In fact, soldiers say, it makes t