Hello Capt Whiz, great to have you around.
Lt Dick Dennis was a veteran of the air battles over Darwin Australia, and is mentioned in the book "Protect and Avenge - The 49th Fighter Group in World War II" by Ferguson and Pascalis.
Here's some info that fateful day in December 1942, straight from the book.
"The USAAF and RAAF again combined forces in another strike to Lae on December 18th to seek out the enemy air force. The infamous Lae wing proved it was still very deadly.
As the Beaufighters and A-20s roughed up the Lae Airdrome, twelve Eightballs flew in high cover over the target area. As the fighter-bombers withdrew, another rain front began to close in over the Markham River delta which masked the approach of the defending Zeros. They swept out of the mist in one firing pass and none of the Americans could bring their guns to bare. The Eightball elements separated and escaped in flights of ones and twos, except the mission leader.
Indeed, veteran Dick Dennis never returned to 3 Mile. No one saw his ship go down, nor heard a distress signal. Dennis had most certainly been killed instantly in the sudden attack, and the loss of the beloved cadre officer was a staggering blow to the entire Eightball outfit."
(Protect and Avenge - The 49th Fighter Group in World War II. Ferguson, Pascalis [p98])
Good luck with your research in DC.
Cheers
Peter