Welcome to Knifeforums, Don.
The best place for identification questions is The Bernard Levine Custom Knives and Collector's Forum
. Even better, if you may be interested in your own source for this sort of information, is Bernard Levine's Guide to Knives and Their Values -- but get the 4th Edition. The "5th Edition" was even disavowed by Mr. Levine.
Since I have a 4th Edition, I looked your knife up in it
and found it, too! on page 452, U.S. Military Mess Cutlery:
"After the United States entered World War I, in April 1917, mess kit cutlery was again supplied by contractors. Aluminum handled knives were made in 1917 by L.F.& C. etc."
As yours is all steel, it looks like a later run, but at least the company is attested to, even if I couldn't find a breakout for the initials.