Built in 1960 as A4D-2N (redesignated A-4C in 1962). Served in the US Navy from 1960 to 1972 with BuNo 147742 (this number is still visible on the inside of the open front landing gear cover). Stored at Military Aircraft Storage and Disposition Center (Tuscon, AZ) from 1972 to 1980. Delivered to the RSAF on 29 October 1980 and later converted in Singapore to the TA-4S-1 version. From 1985 to 1991 upgraded to version TA-4SU (new engine, as well as advanced weapons delivery and navigation system). Decomissioned in 2006 and then placed on display at Republic of Singapore Air Force Museum.

On display at the RSAF Museum. The TA-4S and TA-4S-1 were upgraded by Singapore Aircraft Industries (SAI) into the TA-4SU Super Skyhawk, of which the RSAF was the only operator of the type with its unique double cockpit arrangement. The two-seat Skyhawk trainer was combat capable. SAI replaced the Wright J65 turbojet with a non-afterburning GE F404 engine on RSAF Skyhawks during the upgrade.

The ST Aerospace A-4SU Super Skyhawk is a major upgrade project of the Douglas A-4S Skyhawk attack aircraft undertaken by Singapore Aircraft Industries (SAI, now ST Aerospace) in the 1980s. It was used exclusively by the Republic of Singapore Air Force (RSAF), serving in the fighter-bomber role from 1989 until retirement from front line service in 2005. Since mid-1999, the A-4SU took on the additional role of being the designated advanced jet trainer (AJT) aircraft for the RSAF's AJT training program/detachment in Cazaux, France.