On 1/13/45 the 8th Naval District at New Orleans was sent directions to paint ARL-15, ARL-18, ARL-26, ARL-31, ARL-35 & ARL-38 in either 31/5L or 31/8L with plans on the way and until then use 31/20L for LST's.
ARL-15 was sent drawings for 31/5L on 4/2/45, but had previously painted in 31/20L.
A photo of the starboard side of USS Minotaur (ARL-15) on March 10, 1945, at Pensacola, Florida wearing camouflage pattern 31/20L. The colors of many panels seem to differ from the panels in the drawing. Photo source: NARA BuAer 306194.