From the info Robert gives, it appears he was mostly with the 796th Engineer Forestry Battalion. The other 2 units were Engineer Forestry Companies. I havent found anything of the 1063rd or 1391st going to the pacific.
796th Engineer Forestry Battalion
Campaign Credits:
(13) Leyte, Companies A & C only
(15) New Guinea, Companies A, B & C only
25 Ardennse-Alsace
26 Central Europe
34 Rhineland
Occupation Germany, 2 May - 4 July 45
Meritorius Unit Commendation, 1 Nov 44 - 1 June 45, GO 219, Hqs TSFET, dtd 29 Aug 45.
(note: TSFET was the Theater Services Forces, European Theater, Formerly the services command, COMZ.)
1391st Engineer Forestry Company
Campaign Credits:
26 Central Europe
32 Northern France
34 Rhineland
Occupation Germany, 2 May - 14 Aug 45
1063rd Engineer Forestry Company
Campaign Credits:
26 Central Europe
Occupation Germany, 2 May - 4 June 45
There is a copy of the unit history of the 796th available at the Eisenhowr Library;
Box 668
796th Engineer Forestry Battalion
http://www.eisenhower.utexas.edu/Research/finding_aids/pdf/US_Army_Unit_Records_Index.pdf
Records for the 1063rd & 1391st would be in the National Archives in College Park, MD.
There is a newspaper article on the 796th`s training in Oregon at:
There appears to be a typo in the article were it mentions units attached to the 796th during this training, the article lists the 1931st Eng Forestry Co., but there was no such unit so it was most likely the 1391st Forestry Co.
Related information links:
ENGINEER FIELD MANUAL FM5-5
ENGINEER TROOPS
11 October, 1943
http://www.ibiblio.org/hyperwar/USA/ref/FM/PDFs/FM5-5.PDF
http://www.tioh.hqda.pentagon.mil/Awards/legion_of_merit.aspx