The author of the upcoming book, Defending Singapore: The Singapore Armed Forces, is looking for the identity of the soldier who inspired the open mobilisation logo. The logo was created as a sketch based on an old photograph of the soldier at a rifle range 23 years ago.
The author, David Boey thinks that the soldier might have served at the Charlie Company of the 1st Guards Battalion, or the Infantry Training Depot. He should be in his early 40s now and his surname could be 'Liew' or 'Lien'.
You can contact the author at dboey[at]sph[dot]com[dot]sg if you have any information regarding this mystery.
(Thanks Mr Big)