Hello, long time lurker 1st time poster.
I believe you are looking for the 57th Engineer Combat BN. They were formed on 4/23/42 in New Caledonia and deactivated on 10/12/45 at Ft Lawton Washington. They were attached to the 23 ID (Americal Division) and were posted to New Caledonia, Gaudalcanal,Fiji,Bougainville and the Philippines. The info came from Shelby Stantons WW2 order of battle. If you noticed the goat is leaning on a shovel