Up to 100 hours of this 1500 may have been obtained in a flight simulator or flight training device provided that time was obtained in an approved course conducted by a training center certified under FAR part 142 (our military training programs like UPT are generally not part 142 certified, though the military may have sent you to a part 142 program to get qualified in certain aircraft, or you may have gotten training at a part 142 program at some point in your pilot career).