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Wikipedia and other sources contain statements such as, “The M-388 round used a version of the Mk-54 warhead, a very small sub-kiloton fission device. The Mk-54 weighed about 51 lb (23 kg), with a yield equivalent to somewhere between 10 and 20 tons of TNT—very close to the minimum practical size and yield for a fission warhead.”

I see a video of text firing the device and it looks like a significant explosion to me.

I see a picture of a man holding the warhead with a yield four times as great as the largest conventional bomb produced by the Allies in the Second World War.

This weapon was made in the late 1950’s. Our attitude toward safe shielding is much different now than then (would make it heavier now). I stand corrected, it does say it was a fission weapon. I'm doubtful if that tells the real story of the power.

Davy Crockett (nuclear device)

https://en.wikipedia.org/wiki/Davy_Crockett_%28nuclear_device%29

The M-388 round used a version of the Mk-54 warhead, a very small sub-kiloton fission device. The Mk-54 weighed about 51 lb (23 kg), with a yield equivalent to somewhere between 10 and 20 tons of TNT—very close to the minimum practical size and yield for a fission warhead.

The M-388 would produce an almost instantly lethal radiation dosage (in excess of 10,000 rem, 100 Sv) within 500 feet (150 m), and a probably fatal dose (around 600 rem, 6 Sv) within a quarter mile (400 m).

The units were deactivated in mid-1968.

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So the effective kill range is 500 ft-1/4 mile. This makes me ask the question, is it a fission device because of it's explosive capability or the radiation it emits?