When he returned home Friday, the former Marine did what many of the parents outside the school could not.
"'I love you' was the first thing I said," Corbo recalls. "And we hugged a lot. Of course, he's 7 years old, so a hug in the morning is fine, and before you go to bed, but getting hugged all day long, he's wondering what the heck's going on.
"He'll understand someday."
Manna says his grieving will come later. "For now, (I've) gotta be strong."
Today, Newtown is awash with emblems of tragedy: an enormous American flag, starkly silhouetted against the sky, flies at half-staff in the middle of Main Street.
Just east, on the road that leads towards Sandy Hook Elementary, a host of 27 wooden angel statues sing a silent chorus on the roadside, a tribute to those who died Friday. Police say Adam Lanza shot and killed his mother at the home they shared, before carrying out the rampage at the school where he left 26 dead and also shot and killed himself.
A small bright note is the overwhelming support Newtown has been receiving from around the country and the world -- including truckloads of teddy bears that firefighters are distributing to children's groups, schools and churches..
"The community will go on," Corbo says. "We have to. There are still a lot of children in this town waiting for Christmas to come. You have to move on. For their sake, it's gotta be back to normal as soon as we can get it."