Generate random codenames similar to those used by the US Armed Forces.

Example

$ for((i=0;i<20;i++)); do
> codename
> done
STRONG BITE
BUGLE CORK
PILOT SOFT
VIGILANT ALTER
DORIS FLEX
LOCKER QUAKE
SAFER MOSS
CRYSTAL SUN
CAMEO MODEL
DANCING MIX
CLUSTER EFFORT
EAGLE GIRL
COLT PLATO
LEFAIR DEW
CLASSIC SABER
BULK SPRUCE
SEED ORATOR
MANDRAKE RIDE
EXPRESS ORION
EXOTIC PEREGRINE