Another kid flunked on "caliga". I might have too. I remember "Caligula" the son of Marcus Aurelius,
whose nickname he got as a child when his father was conducting military campaigns in Germany,
and he wore "little boots" similar to the ones the soldiers wore, which were caliga.

CAŽLIGA, a strong and heavy shoe worn by the Roman soldiers.
Although the use of this species of calceamentum extended to the
centurions, it was not worn by the superior officers. Hence the common
soldiers, including centurions, were distinguished by the name of caligati