The Daplona base training center was a base located on the planet Ciutric IV.
It was here where the clone of Ysanne Isard hid while letting Wedge Antilles believe she was piloting the Imperial Assault Shuttle he was chasing.
Antilles was not fooled however. After shooting down the shuttle, he used the scans of the shuttle's comm frequencies to triangulate her location from which she was directing the pilot of the shuttle. He let loose a pair of concussion missiles which destroyed the building and effectively killed the clone.