The SAF is being developed to respond to a wide range of issues in both conventional and unconventional warfare. The Defence Science and Technology Agency is responsible for procuring resources for the military. The geographic restrictions of Singapore mean that the SAF must plan to fully repulse an attack, as they cannot fall back and re-group. The small size of the population has also affected the way the SAF has been designed, with a small active force and a large number of reserves.