It looks like your dad arrived at Polebrook in the fall of 1943. From your dad's last mission you have the following crew list:
22 Dec. 1943 - Osnabruck, Germany
42-39778 DS-A Lucky Ball
ATO 11:14
P 2Lt Lewis J. Maginn
CP 2Lt Walter H. Brooks
N 2Lt James D. McMorrow KIA
B 2Lt Wallace J. Rufeisen
TT S/Sgt David R. Shrom
RO S/Sgt Boyd E. Baker
LW Sgt Albert R. Meyer KIA
RW Sgt Edward H. Bucceri KIA
BT S/Sgt Docite Nadeau KIA
TG S/Sgt Clarence A. Rowlison KIA
His earlier missions are: (Crew members are listed where different from above mission.)
26 Nov 1943 - Bremen, Germany
42-39778 DS-A Lucky Ball
Actual Time Out 08:23
Actual Time Returned 15:17
TT Sgt Thomas F. Harkins
RO Sgt Lester W. McClure
BT Sgt Walter R. Snyder
TG Sgt James F. Phillips
(This is probably the "original" crew.)
29 Nov 1943 - Bremen, Germany
42-39778 DS-A Lucky Ball
ATO 11:11 - ATR 16:03:30
Mission was recalled by group leader, after a number of ships aborted because of weather.
(Same crew as 26 Nov.)
1 Dec 1943 - Solingen, Germany
42-37731 TU-A
(Crew was to take 42-29821 YB-F Argonaut, but plane failed to take off. No ATO for 731-A given. Plane landed at Framlingham.)
RO Sgt Lester W. McClure
RW S/Sgt John S. Emigh
TG Sgt James F. Phillips KIA
(Phillips oxygen supply failed.)
5 Dec 1943 - Paris, France (No bombs dropped, 10/10 overcast.)
42-39778 DS-A Lucky Ball
ATO 08:31 - ATR 13:45
RO Sgt Lester W. McClure
BT Sgt John W. Reed
TG S/Sgt Richard S. Drews
13 Dec 1943 - Kiel, Germany
42-37832 RQ-N Casa de Embriagos
ATO 08:42 - ATR 15:37
RO Sgt Lester W. McClure
BT Sgt Walter R. Snyder
TG Sgt James Mansfield (509th)
16 Dec 1943 - Bremen (Recalled - Overcast, no bombs dropped.)
42-29858 YB-G Murder Incorporated
ATO 08:41 - ATR 15:04
RO Sgt Lester W. McClure
BT Sgt Walter R. Snyder
TG SSgt John H. Swistak
20 Dec 1943 - Bremem, Germany
42-29877 DS-X Speed Ball
ATO 08:32 - ATR 11:07
(Crew aborted - TG sick)
RO Sgt Lester W. McClure
BT Sgt Walter R. Snyder
TG SSgt Kenneth E. O'Brien