Abbreviation Definition Category Type of Unit

1 Abbreviation Definition Category Type of Unit 239 Aer Sq 238th Aero Squadron Organization Aero 39 Inf 39th Infantry, 7th Infantry Brigade, 4th Division Infantry 65 Bln Co 65th Balloon Company Aero 815 Pion Inf 815th Pioneer Infantry Infantry 830 Aer Sq, Selfridge Field, Mich 830th Aero Squadron, Selfridge Field, Michigan Aero 89 Div 89th "Middle West" Division Div Dept of Military Aeronautics Camp Department of Military Aeronautics Camp Aero 1 Army MP 1st Army Military Police MP 1 Bln School Sq, AS, Sig C 1st Balloon Squadron, Air Service, Signal Corps Aero 1 Bln School Sq, Ft Omaha, Nebr 1st Balloon Squadron, Ft.

2 Omaha, Nebraska Aero 1 Cav 1st Cavalry Regiment Cavalry 1 Dep Div, AEF 1st Department of Division, Allied Expeditionary Forces Dep 10 Div Erroneous listing. There was not a 10th Division 10 Engrs 10th Engineer Regiment Organization Engineer 10 F Bn, S C 10th Field Signal Battalion, 7th Division Organization Signal 10 Rct Co (Band) 10th Recruiting Company (Band), General Service, Infantry Organization Rctg 101 Am Tn 101th Ammunition Train, 26th "Yankee" Division Organization Ammo 104 Inf 104th Infantry Regiment, 26th "Yankee" Division Organization Infantry 112 Spruce Sq 112th Spruce Squadron Organization Spruce 113 F Sig Bn 113th Field Signal Battalion, 38th "Cyclone" Division Organization Signal 115 Spruce Sq 115 Spruce Squadron, Spruce Production Division Spruce 116 Am Tn 116th Ammunition Train, 41st Division Organization Ammo 116 Engr 116th Engineer Regiment.

3 41st Division Organization Engineer 116 Eng Tr 116th Engineer Train, 41st Division Organization Engineer 116 F Signal 116th Field Signal Battalion, 41st Division Organization Signal 116th Train Hq 116th Train Headquarters and Military Police, 41st Division Organization Train 116 Sn Tn 116th Sanitary Train (Ambulance Companies & Field Hospitals 161, 162, 163, 164), 41st Division Organization Sanitary 116 Spruce Sq 116th Spruce Squadron, South Bend, Washington, Spruce Production Division Organization Spruce 116 Sup Tn 116th Supply Train, 41st Division Organization Supply 116 TM Btry 116th Trench Mortar Battery, 66th Field artillery Brigade, 41st Division Organization artillery 118 Engrs Erroneous listing.

4 There was not a 118th Engineers Organization Engineer 119 Spruce Sq 119th Spruce Squadron, Spruce Production Division Organization Spruce 12 Inf 12th Infantry Brigade, 8th Division Organization Infantry 123 Sp Sq 123rd Spruce Squadron, Spruce Production Division Organization Spruce 13 Aero Sq 13th Aero Squadron (Pursuit), 2nd Pursuit Group, 1st Pursuit Wing, Air Service Organization Aero 13 Cav 13th Cavalry Organization Cavalry 13 Inf 13th Infantry Brigade, 7th Infantry Division Organization Infantry 13 Sn Tn 13 Sanitary Train Organization Sanitary 132 Aer Sq 132nd Aero Squadron, Air Service Balloon Corps Aero 135 Aer Sq 135th Aero Squadron (Observation), 4th Corps Group, 1st American Army, AEF, Air Service Organization Aero 14 Aer Sq 14th Aero Squadron, Air Service Organization Aero 14 Co, Cas.

5 Det, , Vancouver, Wash. to disch 14th Company, Casual Detachment, Spruce Production Division, Vancouver, Washington Organization Spruce 14 Grand Div, TC 14th Division (Grand), Tank Corps? (There does not seem to have been a 14th Division Organization Infantry 14 Inf 14th Infantry Brigade, 7th "Hourglass" Division Organization Infantry 146 FA 146th Field artillery Regiment (155mm), 66th Field artillery Brigade, 41st Division Organization Field artillery 147 FA 147th Field artillery Regiment, 66th Field artillery Brigade, 41st Division Organization Field artillery 148th MG Bn 148th Machine Gun Battalion, 81st Infantry Brigade, 41st Division Organization Machine Gun 148 F A 148th Field artillery Regiment, 66th Field artillery Brigade, 41st Div Organization Field artillery 150 Dep Brig 150th Department of Brigade Organization Dep 158 Inf 158th Infantry Regiment, 79th Infantry Brigade.)

6 40th "Sunshine" Division Organization Infantry 16 Inf 16th Infantry Regiment, 1st Infantry Brigade, 1st Division Organization Infantry 160 Inf 160th Infantry Regiment, 80th Infantry Brigade, 40th "Sunshine" Division Organization Infantry 162 Inf 162nd Infantry Regiment, 81st Infantry Brigade, 91st Division Organization Infantry 164 Inf 164th Infantry Regiment, 81st Infantry Brigade, 91st Division Organization Infantry 163 F Hosp 163rd Field Hospital, 41st Division Organization Medical 166 Dep Brig 166th Department of Brigade, 41st Division, Camp Lewis, Washington Organization Dep 166 Engrs 166th Engineer Regiment, 41st Division Organization Engineer 166 FA 166 Field artillery Brigade, 91st Division Organization Field artillery 18 Inf 18th Infantry Regiment, 1st Infantry Brigade, 1st Infantry Division Organization Infantry 18 Engrs (318?)

7 18th Engineer (No 18th Engineer, Might be 318th Engineer, 6th Division) Organization Engineer 180 Aer Sq 180th Aero Squadron Organization Aero 181 Inf Brig 181st Infantry Brigade, 91st Division Organization Infantry 182 Inf Brig 182nd Infantry Brigade, 91st Division Organization Infantry 1st Lt First Lieutenant Officer Rank Rank 1st Rep Dep 1st Replacement Depot Organization QMC 1st Sgt First Sergeant Enlisted Grade Grade 2nd Lt Second Lieutenant Officer Rank Rank 2 FA 2nd Field artillery Brigade, 2nd Division Organization Field artillery 2 Inf 2nd Infantry Brigade (Washington National 161st Infantry Brigade), 41st Division Organization Infantry 2 Prov Rgt 2nd Provisional Regiment (Spruce Production Division) Organization Spruce 2 Reg Inf 2nd Regular Infantry, Washington National Guard ?

8 ? Organization Infantry 20 Engrs 20th Engineer Regiment Organization Engineer 202 Stev Bn 202th Stevedore Battalion Organization Trans 213 Engrs 213th Engineer Regiment Organization Engineer 213 Fld Sig Bn 213th Field Signal Battalion Organization Signal 22 MG 22nd Machine Gun Battalion, 8th Division Organization Machine Gun 22 Tng Btry, FA, COTS 22nd Training Battery, Field artillery , Commissioned Officer Training School, Camp Taylor, Kentucky Organization Officer Training 22nd Balloon Sq 22nd Balloon Squadron Organization Aero - Balloon 23 Inf 23rd Infantry Regiment, 3d Infantry Brigade, 2nd Division Organization Infantry 24 Balloon Sq (Company?)

9 24th Balloon Squadron Organization Aero 25 Cav 25th Cavalry Regiment Organization Cavalry 25 Inf Engrs 25th Infantry, Engineer Regiment? Organization Engineer 27 Arty, CAC 27th artillery , Coast artillery Corps Organization artillery 27 Engrs There was no 27th Engineer Regiment, might be the engineer unit from the 27th Division Organization Engineer 28 Aer Sq, Selfridge Field, Mich 28th Aero Squadron, Selfridge Field, Michigan Organization Aero 28 Engrs 28th Engineer Regiment? Organization Engineer 28 Inf 28th Infantry Regiment, 2nd Infantry Brigade, 1st Division Organization Infantry 29 Prov.

10 Sq., , , Agate Beach, Ore 29th Provisional Squadron, Spruce Production Division, Air Service, Signal Corps, Agate Beach, Oregon Organization Spruce 2d Inf, Idaho 2nd Infantry Brigade (Idaho National 166 Engineer Regiment) Organization Infantry 2nd Lt Second Lieutenant Officer Rank Rank 3 Inf Third Infantry Brigade, 2nd Division Organization Infantry 3 Spruce Sq 3rd Spruce Squadron Organization Spruce 306 Inf 306th Infantry Regiment, 153rd Infantry Brigade, 77th Division Organization Infantry 307 Am Tn 307th Ammunition Train, 82nd "All American" Division Organization Ammo 308 Inf 308th Infantry Regiment, 154th Infantry Brigade, 77th "Metropolitan" Division Organization Infantry 31 Engrs 31st Engineer Regiment?