Tough nut to crack! Trying to find any info on 1Lt. L. R. Blackburn

I am trying to find any info on a pilot, 1Lt. L. R. Blackburn. Here is why I am looking for him and what I do know of him (very little, no first name, no service number).
On February 28, 1942 a sailor from my home town of Leicester, MA. was killed in action when his ship, USS Jacob Jones DD-130, was torpedoed and sunk 30 miles southeast of Cape May, NJ. That morning a 1Lt. L. R. Blackburn of the 104th Observation Squadron, 59th Observation Group flying out of Atlantic City, NJ. spotted the oil slick and a few survivors. He flew to and alerted a nearby Navy patrol craft which sped to the scene and recovered the survivors. I have a very good record of the sinking and rescue. The only reference to the pilot is his name and squadron.
I have not found any record of him at the following places;
Enlistment records on the U. S. Archives web site, none; Burial records at the ABMC and Veterans Administration web sites, none; Maryland National Guard Archives, no record of him;
What I do know of the 104th Observation Squadron;
104th Observation Sqdn. Maryland National Guard, Federalized February 3, 1941; Inactivated and all personnel transferred to 517th Bomb Squadron, 377 BG October 1942; 517 BS redesignated 12th Anti-Submarine Squadron November 29, 1942; redesignated 859th BS, 492BG September 24, 1943; 492 BG transferred to 8AF England April 1944; 492 BG disbanded August 10, 1944 and given to OSS and redesignated 801st Provisional Group; detached December 17, 1944 to 15th Special Group (Provisional), 15 AF in MTO; redesignated 2641st Special Group (Provisional) May 20, 1945.
I know this is a long shot at best but if anyone knows anything about this man or where to look I would appreciate the help.
 
Thank you,
Patrick McKeon