I am currently in the military and have been having trouble with my run times, stairs, daily chest cramps, etc over the last year. Back in 1997 at 36 years old, (169lbs, 71 in), I did a Pulmonary functions test with the following results:FVC-5.77, FEV 0.5-4.23, FEV 1.0-5.09, FEV 3.0-5.42,PEF-11.94L/S, FEF 25-75% 7.20L/S, FEF75-85%-2.08L/S, FEF25% 11.35L/S, FEF50%-8.08L/S, FEF75% 3.43L/S AND FEF.2-1.2 9.44L/S. After having the problems with running, stairs, getting winded easy, I did several more tests in the last few months. MRI and x-rays turned out normal. In July I had the following Pulmonary test results (43, 170lbs, 71 in): FVC-4.30, FEV 0.5-3.04, FEV1.0-3.66, FEV3.0 4.05, FEF-11.02, FIF25%-4.52, FIF50%-6.23, FIF75%-4.99, FIF25-75%-5.42. I have been referred to an off-military facility and they want to do a lung biopsy. All the Pulmonary Specialists agree that this is a pretty major shift. I have lived or worked in various nasty areas to include five years in the shipyards, numerous aircraft crash investigations, associated chemicals and fibers in the aircraft industry, and a year living with a 30 by 25 foot Rockwool pile 10 feet away. I have had my share of possible exposures. The question is, does this look like a major shift in my lung capacity and is it a good idea to do the biopsy with its associated risks? I turned 44 this last month and wonder if maybe I am just getting old? I am also heading back to Iraq in the near future and want to make sure that my health can handle another year in that environment. Any feedback would be most appreciated.