Thought on eating less than TDEE-20% for a few weeks?

I'm currently 159.8, 5'9", & 24. My ultimate goal weight is between 135-140. I lift moderately heavy (3 sets of 10-12 at a weight where the last couple of reps are a bit challenging), full body routine, 2-3 times a week, take a kickboxing bootcamp for 90 minutes 3 times a week on non-lifting days, then I run a couple of miles a few times a week as well. I'm working on getting into better shape to join a police force. Anyway, I've been eating around 1700 for a while & have been slowly losing, but I graduate from college & am moving to a new state in 4 weeks & have been thinking about lowering my calories to 1500 until then to lose weight a little quicker, then gradually increasing to my TDEE -15-20% after I move. According to scoobysworkshop, my TDEE is about 2400, so if I eat 1500 then thats about 35% under TDEE. I'll also probably allow myself a cheat meal per week. I know this isn't exactly ideal, but since I plan on doing it short time I was thinking I'd probably be ok? Will this mess up my metabolism long term? Also, I've read & heard that lifting & eating adequate protein helps to maintain more lean muscle when people eat low calorie. I know I'll lose some muscle, I just want to mainly lose fat. Any advice or experience would be great!