BosnMate, Thanks for all the info! The two necked down cases have "VPT 38" on one and "SL 43" on the other. There are a few of the regular type cases with the F on top, the number 12 on the left and the number 94 on the right side. Another one has the letter R on top, the letter W on the bottom, the number 6 on the left and the number 86 on the right.
Most are the U.M.C. or the W.R.A Co. casings. Some are very worn and difficult to read. Guess this project will keep me busy!
Thanks for all the help, everyone!