Hi,
Cook will hire from outside .... when positions are open. Currently, there are a few former CNP employees helping to augment the Ops Training Staff, and others are near retirement, so I'm sure a new license would be very desirable.
The ILT classes tend to start every year in the October time frame, with selection being in the summer. The next one will start in 2016.
That said ... I wouldn't be shy about sending your resume to Cook, cold, with what you're hoping to get in the way of a job.