Newly minted Pfc. Matt McGuiness holds the battalion guidon during his recruit training graduation ceremony Jan. 15. McGuiness endured painful surgeries and a long recovery after being medically discharged from Marine Corps recruit training a year earlier due to lung problems. - Newly minted Pfc. Matt McGuiness holds the battalion guidon during his recruit training graduation ceremony Jan. 15. McGuiness endured painful surgeries and a long recovery after being medically discharged from Marine Corps recruit training a year earlier due to lung problems.