The old NCO Club is now becoming a "lifestyle" extravaganza - like so much of Singapore it will be cleaned up, gutted, and have a huge tower built within it. I was here about 20 years ago briefly with my Dad and it was still the NCO's club with a wonderful swimming pool. I believe this place was built so the "lesser" NCO's had their own club directly across the road from Raffles where only officers could go. This used to be on the ocean too.
Some excellent background information here. You'll find a bunch of images, including the club and the ocean front (now all filled in).