I know not when nor if the disaster was de-classified, but I can say from independent research that some documents were marked SECRET.
SENSITIVE DOCUMENT And the transcript of the TBS (Talk Between Ships),wherein it was determined that these low flying planes weer FRIENDLY,seemed to disappear.
Its clear that authorities feared the outrage if parents were made aware OF HOW and WHY their sons died.
In brief, these bad judgement calls, if known, would cause a stink.Just hunker down - and tell the folks "Killed in Action"
1.A No No To transport over 500 troops on a ship laden with 7000 tons of explosives.
2.A judgement call defying common sense, a flight of planes incoming dead ahead, just skimming the water, were deemed to be Friendly, and let into the convoy unmolested to sink the troop transport. Gunners were told "Friendly Planes - Do Not Fire."
3.Gunnery doctrine limited to firing only at seen target, and only when satisfied own ship position is known by the enemy plane.Since the torpedo planes were skimming the water, this doctrine resulted in Escorts and Armed Guards firing at each other. However, nobody was killed by friendly fire.
In later convoys (UGS-40), gunnery doctrine allowed a barrage of firing when the low flying torpedo planes were first sighted.19 planes were downed with no loss of ships.
In summary, if not for bad judgement, UGS-38 Convoy would have had no judgement at all.