Why does the ICAO alphabet use "Charlie" for C? Why does the ICAO alphabet use "Charlie" for C? Specifically, why choose "Charlie", which has a "Ch" sound, rather than a word with the hard "C" such as "Carl"?

A cursory Googling turns up nothing.
Hard C sounds too much like K.  Ch (Charlie) will not be confused with K (Kilo). And soft C sounds too much like S (Sierra).