The slight moistening of a soldier/ex-soldier's eyes when they remember a fallen comrade. Can also apply to anyone who has lost someone close to them. They're not crying, they're just overcome with allergies is all...
Around June 27th, 2013, a young injured airman passed away in Florida after suffering injuries from an I.E.D. in Iraq. I'm sure his fellow airmen must get a few soldier allergies thinking about him now and then.
Sometimes I think about Papa and the stories he used to tell us. I'm getting a slight case of soldier allergies just typing this...