Desmond Kuek | 17/08/2004
Singapore. Ministry of Defence
Desmond Kuek | 20/02/2006
Desmond Kuek | 23/03/2007
Desmond Kuek | 16/05/2007
Desmond Kuek | 01/04/2010
Desmond Kuek | 04/07/2011
Singapore. Ministry of the Environment and Water Resources