Commanding Officer : Colonel Rupert D. Grave
Assistant Regimental Commander : Maj. George R. "Ike" Walton1
Regimental S-1 : Capt. Robert B. Pearce
Regimental S-2 : Capt. Albin Dearing2
Regimental S-3 : Maj. Forest S. Paxton3
Regimental S-4 : Maj. William P. Hickman
Regtl. Commo Officer : Capt. Richard A. Bigler
Service Company : 1st Lt. Kenneth B. Freund
Hq & Hq Co. : Capt. Herman B. Dickerson
XO Hq & Hq Co. :
Regimental Surgeon : Maj. Paul Vella
Demolition Platoon : 1st Lt. John A. "Boom Boom" Alicki
Chaplain :
Capt Alfred J. Guenett (Catholique)
Capt. Charles Brown (Protestant)
1ST BATTALION
Commanding Officer : Lt. Col. William Boyle
Assistant Battalion Commander : Maj. Herbert M. Bowlby
Battalion S-1 : Capt. John E. Dugan
Battalion S-2 : Capt. William H. Young
Battalion S-3 : Capt. William H. Young
Battalion S-4 : 1st Lt. William E. Price
Mortar Platoon Leader : 1st Lt. Guynne T. "Pop" Moreland
Machine Gun Platoon Leader : 2nd Lt. William L. Kruse
Communication Officer : 1st Lt. Robert L. Lynch
Battalion Surgeon : Capt. Benjamin Sullivan
HQ Company : Capt. Earl H. Ehly
A Company : Capt. Donald W. Fraser
B Company : Capt. Dean D. Robbins
C Company : Capt. Charles E. La Chaussee
2ND BATTALION
Commanding Officer: Lt. Col. Richard J. Seitz
Assistant Commander : Maj. Thomas R. Cross
Battalion S-1 : 1st Lt. Paul D. Lewis
Battalion S-2 :
Battalion S-3 : 1st Lt. Ferdinand E. Peche
Battalion S-4 : 1st Lt. Maurice J. Miley
Hq & Hq Co. : Capt. Robert B. Clauer
Battalion Surgeon : Capt. Harold J. "Doc" Megibow
Mortar Platoon Leader 1st Lt. Lt. Frank N. "Jack" West
Assistant Mortar Platoon Leader : 2nd Lt. Albert M. Robinson Jr.
Machine Gun Platoon Leader : 1st Lt. Walter G. Irwin
Communication Officer : 1st Lt. Harold L. "Snapper" White
HQ Company: Capt. Robert B. Clauer
D Company : Capt. David H. Armstrong2
E Company : Capt. Robert H. Newberry
F Company : Capt. John F. McKinley
3RD BATTALION
Commanding Officer : Lt. Col. Melvin Zais
Assistant Commander : Maj. Robert McMahon
Battalion S-1 : 1st Lt. Russell C. Johnson
Battalion S-2 : 1st Lt. John H. Neiler
Battalion S-3 : Maj. Forrest S. Paxton
Battalion S-4 : 1st Lt. Joseph H. Calder
Battalion Surgeon : Capt. Walter P. Plassman
Mortar Platoon Leader : 1st Lt. Robert Weber
Machine Gun Platoon Leader : 1st Lt. Joseph Largan
Communication Officer : 1st Lt. Thomas J. Priest
HQ Company : Capt. Joseph McGeever
G Company : Capt. Grant A. Hooper
H Company : Capt. Marvin D. Morris
I Company : Capt. Martin Fastia