OK, the ideas I see here are getting crazier by the
post...
Edit: 
Sell them
to the Navy, and let them use those buses in and around Changi
Naval Base 
.
(p.s. I'm serving my N.S. in the Navy right now, and I was at
Changi Naval Base a few days ago. The Tanah Merah shuttles were
air-conditioned, but their internal shuttle bus was a creaky old
non air-conditioned bus...)
