Specification history for the TL-29:
The first spec for this pattern was RL-A-532
RL-A-532 was originally issued in 1919.
RL-A-532 was superseded in 1954 by MIL-K-13419
MIL-K-13419 was superseded in 1965 by GGG-K-484
GGG-K-484 was cancelled in 1997.
None of them called for 440C blade steel.
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That's all well and good, Frank. Which steel would you rather rely upon in a military setting, 440A or 440C?