451 bombardment group

I am seeking any information about my father-in-law, Vernon G. Slavich (deceased). He was a navigator in the 727 bomb squadron in Castellucio from Oct. 1944 - April 1945. My husband, Vernon's son, and I have been reading letters that he sent home during this time, but he never names any of the men he served with. We are trying to 'fill some holes' and any info will be appreciated. Thanks.