Bruce, the descendents of Charles C. Simms, through his son Richard Douglas Simms, have graciously checked the catalog for their privately-held family archive. There is no indication that military records have been passed down through their family. They are aware of your search for the crew and I trust will share anything that they may come across in the future. I am sorry that this wasn't the answer you had wanted but happy to have met more Simms family members in the process.
Good luck! Anne