An 87-year-old former Marine who spent two tours in Vietnam and has multiple health conditions survived an epic battle with coronavirus, asserting, “The Marine Corps trains us to deal with adversity; they teach us to adapt, overcome, and continue the mission.” He added another reason for his survival: “And finally, the grace of God. That’s what I have here.” Franklin Eller told CBS News, “I’m feeling great. And I was really fortunate to find myself laying here at the Mayaguez Medical Center. As you may know, I was evacuated from a ship; we were on a cruise in the Caribbean....