"break" is already a keyword, so another generic term would need to be chosen. "ExitLoop" or something.

The reason for using a generic "break" (or similar) keyword rather than something explicit like "exit for" is that it is used to break out of a control structure regardless of type.

The benefits may not be obvious until you consider nested control structures, and where you are supporting a count parameter for break.

Some languages support the count parameter (help me out guys, I can't remember which). 'C' does not support it, and there have been a number of times I've been stuck deep in nested loops and cursed it's omission. Usually in network related code for some peculiar reason.

This allows you to break selectively out of nested loops for example:
code:
For
   Do
      While
         ExitLoop 2
      Loop
   Until
Next
The "2" count will cause the code to break out of two nested loops, i.e. the While/Loop then the Do/Until constructs, but not the For/Next.