King et al report a series of 80 otherwise healthy young vets who failed a 2-mile run fitness test due to dyspnea at Fort Campbell, KY. Many had been exposed to sulfur fires or other inhalational exposures. Among 49 who underwent open lung biopsy, 38 had constrictive bronchiolitis, an extremely rare condition in otherwise healthy young people. NEJM 2011;365:222-230.  FREE FULL TEXT