The Challenge
You'll be trained in one of these four areas of specialisation:
1) WSO Fighter
You'll work in the F-16 Fighting Falcon D, one of the world's most sophisticated fighter aircraft, and be involved in planning missions, flight navigation, monitoring surface and air threats as well as targeting.
2) WSO Command, Control and Communications (C3)
You'll command fighter aircraft in performing intercept operations, time-sensitive search & rescue mission and precision-demanding air traffic control operations.
3) WSO Air Defence Artillery (ADA)
You'll be in charge of operating our state-of-the-art air defence systems, and to engage and stop intruders with our short and medium range anti-aircraft guns and missiles.
4) WSO Unmanned Aerial Vehicle Systems (UAV)
You'll help in obtaining tactical advantages by means of surveillance operations. You'll also be entrusted with gathering accurate and highly classified information vital to our defence.
The Requirements
As a Weapon Systems Officer, you should be:
a Singapore citizen
combat fit (PES A or B)
Your eyesight should be:
normal colour vision
not more than 500 degrees per eye for WSO(C3, UAV & ADA)
not more than 200 degrees astigmatism per eye for WSO(C3, NAV, UAV & ADA)
not more than 400 degrees per eye for WSO(FTR)
not more than 100 degrees astigmatism per eye for WSO(FTR)
Academically, you should have a degree, Diploma or a full GCE 'A' Level Certificate.
source
http://www.mindef.gov.sg/imindef/mindef_websites/atozlistings/air_force/careers/opportunities/wso.html