Originally Posted by
USMCFLYR
The best time to look for a job is when you already have a job.
Are members actually suggesting that looking for a job while you have another job is a problem?

No, the potential issue is starting a new job while on LOA/Vacation from the previous job. Intent being you can go back to your old job if you wash out. This can be a problem if the employers are not aware of what you're doing.
I actually think it's a good idea, given the high failure rate in some training programs.... as long as it doesn't get you fired from the new job.
If both employers know the score and are OK with it, no issues.