Here are a number of sites, resources that as an enthusiast, WW historian, serviceman or family member of the 450th Bombardment Group you might enjoy and find relevant.
Army Air Corps Library and Museum US Army Air Forces of World War II.
AACLM: 450th Bombardment Group
US National Archives
Air Force Historical Research Agency
450th BG Association
History of the 450th Cottontails - Book - Amazon
1st Fighter Group
2nd Bombardment Group
12th Bombardment Group
14th Fighter Group
17th Bombardment Group
31st Fighter Group
47th Bombardment Group
52nd Fighter Group
82nd Fighter Group
97th Bombardment Group
98th Bombardment Group
99th Bombardment Group
301st Bombardment Group
310st Bombardment Group
320th Bombardment Group
321st Bombardment Group
325th Fighter Group
332nd Fighter Group
376th Bombardment Group
445th Bombardment Group
449th Bombardment Group
450th Bombardment Group
451st Bombardment Group
454th Bombardment Group
455th Bombardment Group
456th Bombardment Group
459th Bombardment Group
460th Bombardment Group
461st Bombardment Group
463rd Bombardment Group
464th Bombardment Group
465th Bombardment Group
483rd Bombardment Group
484th Bombardment Group
485th Bombardment Group
2641st Special Group (885th BS)