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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
We searched the World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office, 1905-1981 (Record Group 407) and the Unit Histories, 1943 - 1967 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter), 1917-1999 (Record Group 338) but were unable to locate any records of the 499th Anti-Aircraft Artillery (AAA) Gun Battalion or the 499th Coast Artillery Battalion (CA Bn).
We did find a notation for the “499th CA Bn” on p.501 of the “World War II Order of Battle” by Shelby L. Stanton that stated the following: “Detachment from HHB (Headquarters and Headquarters Battalion) 499th CA Bn (AA) (Gun) (Semimobile), 1st Plat (Platoon), Brty (Battery) A and 2nd Plat, Brty B all activated 10 Apr 42 at Curaco Netherlands West Indies and inactivated there 25 Nov 43.”
We hope this information is helpful. Best of luck with your family research!