Heres an abstract of Maj. O'Dea's service record during the war to put things in context:

ENL Svc: 10 Feb 42-24 Oct 42, Cpl Armor 3d Armor Div.
25 Oct42 Tank Platoon Leader, 12th Armor Div. Ft Campbell KY
12 Apr43 Company Commander, 12th Armor Div. Ft Campbell KY
12 Jul43 Svc Co Comd, 761st Tank Bn, Camp Clayborn LA
21 Apr44 Bn Motor Officer, 761st Tank Bn, ETO
10 May45 BN S-2, 761st Tank Bn, ETO
6 Jul45 BN Executive Officer, 761st Tank Bn, ETO

Photo unknown date or location.

Photos and information courtesy of Tim Goodwin, Capt. O'Dea's grandson.