Battalion and Regiment Original
Lettered Company
Final
Numbered Company
1st Battalion, 20th Engineers Company A 1st Company
Company B 30th Company
Company C 3rd Company
2nd Battalion, 20th Engineers Company D 4th Company
Company E 5th Company
Company F 2nd Company
3rd Battalion, 20th Engineers Company A 7th Company
Company B 8th Company
Company C 9th Company
4th Battalion, 20th Engineers Company D 23rd Company
Company E 11th Company
Company F 12th Company
5th Battalion, 20th Engineers Company A 13th Company
Company B 14th Company
Company C 15th Company
6th Battalion, 20th Engineers Company D 16th Company
Company E 17th Company
Company F 18th Company
7th Battalion, 20th Engineers Company A 19th Company
Company B 20th Company
Company C 21st Company
8th Battalion, 20th Engineers Company D 22nd Company
Company E 10th Company
Company F 24th Company
9th Battalion, 20th Engineers Company A 25th Company
Company B 26th Company
Company C 27th Company
10th Battalion, 20th Engineers Company D 28th Company
Company E 29th Company
Company F 6th Company
Company G * 31st Company *
1st Battalion, 10th Engineers 11th Battalion, 20th Engineers Company A 32nd Company
Company B 33rd Company
Company C 34th Company
2nd Battalion, 10th Engineers 12th Battalion, 20th Engineers Company D 35th Company
Company E 36th Company
Company F 37th Company
41st Engineers 13th Battalion, 20th Engineers Company A 38th Company
Company B 39th Company
Company C 40th Company
Company D 41st Company
42nd Engineers [Regimental HQ Disbanded] Company A 42nd Company
Company B 43rd Company
Company C 44th Company
Company D 45th Company
43rd Engineers 14th Battalion, 20th Engineers Company A 46th Company
Company B 47th Company
Company C 48th Company
Company D 49th Company


* Company G, 10th Battalion, 20th Engineers (31st Company) was composed of New England sawmill units that volunteered for contract work in Great Britain, but who then subsequently volunteered for duty with the 20th Engineers in France.




Reorganization of Engineer Forestry Service Units

Original Battalion Original
Lettered Company
Final
Numbered Company
503rd Engineer Service Battalion (Forestry) Company A 1st Engineer Service Company (Forestry)
Company B 2nd Engineer Service Company (Forestry)
Company C 3rd Engineer Service Company (Forestry)
Company D 4th Engineer Service Company (Forestry)
507th Engineer Service Battalion (Forestry) Company A 5th Engineer Service Company (Forestry)
Company B 6th Engineer Service Company (Forestry)
Company C 7th Engineer Service Company (Forestry)
Company D 8th Engineer Service Company (Forestry)
517th Engineer Service Battalion (Forestry) Company A 9th Engineer Service Company (Forestry)
Company B 10th Engineer Service Company (Forestry)
Company C 11th Engineer Service Company (Forestry)
Company D 12th Engineer Service Company (Forestry)
519th Engineer Service Battalion (Forestry) Company A 13th Engineer Service Company (Forestry)
Company B 14th Engineer Service Company (Forestry)
Company C 15th Engineer Service Company (Forestry)
Company D 16th Engineer Service Company (Forestry)
523rd Engineer Service Battalion (Forestry) Company A 17th Engineer Service Company (Forestry)
Company B 18th Engineer Service Company (Forestry)
Company C 19th Engineer Service Company (Forestry)
Company D 20th Engineer Service Company (Forestry)
531st Engineer Service Battalion (Forestry) Company A 21st Engineer Service Company (Forestry)
Company B 22nd Engineer Service Company (Forestry)
Company C 23rd Engineer Service Company (Forestry)
Company D 24th Engineer Service Company (Forestry)
533rd Engineer Service Battalion (Forestry) Company A 25th Engineer Service Company (Forestry)
Company B 26th Engineer Service Company (Forestry)
Company C 27th Engineer Service Company (Forestry)
Company D 28th Engineer Service Company (Forestry)