Nick Popaditch has only one working eye, but he’s looking toward the future. The former tank commander — whose cigar-smoking photo in Baghdad more than five years ago came to symbolize the defeat of Saddam Hussein in Iraq — finished up a book tour this weekend in Terre Haute, where he attended high school.Popaditch has been on the road with his wife, April, since September. Together, they have promoted his 293-page book, “Once a Marine,” a memoir of his military career, which was cut short after a rocket-propelled grenade hit his tank in Fallujah, Iraq, in 2004, and he lost his right eye as well as the ability to hear out of his right ear.The couple stopped at Indianapolis International Airport today before catching separate flights — April was returning to their home in California and Nick was off to New Jersey to meet with some playwrights.Popaditch, 41, causes a stir when he goes out wearing the prosthetic eye he had in today — there’s a Marine Corps emblem in place of a cornea.“People, they’ll notice it and they will do everything in their power to not stare,” said Popaditch, who has a quick smile and wit. “I wouldn’t put that in there if I didn’t want people to look at it.”