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As it turns out the hose is identical to 100R1, 1 wire hose. I could not make out the numbers on the old hose so I can not say for CERTAIN that the HMMWV uses 100R1 hose but no doubt it can be replaced by 100R1 hose.
BUT i found some hose at Discounthydraulichose.com (no affiliation) called...
Just wanted to confirm before purchasing hose and fitting for my winch that the high pressure hydraulic hose was 3/8 100R1, 1 wire.
By the external dimensions that is what it looks like. I did search and could not find it.