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. 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)

2 , 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, 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.

3 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. 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?

4 (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, 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.)

5 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?) 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 ?

6 ? 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?) 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?

7 Organization Engineer 28 Inf 28th infantry Regiment, 2nd infantry Brigade, 1st division Organization infantry 29 Prov. 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? Organization Engineer 31 Inf 31st infantry Brigade?

8 Organization infantry 31 Ry 31st Railway ? Organization Ry 33 Spruce Sq 33rd Spruce Squadron, Spruce Production division , Organization Spruce 316 Amn Tn 316th Ammunition Train, 91st "Wild West" division Organization Ammo 316 Engr 316th Engineer Regiment, 91st "Wild West" division Organization Engineer 316 F Sig 316th Field Signal Battalion, 91st "Wild West" division Organization Signal 316 Sn Tn 316th Sanitary Train (Ambulance Companies & Field Hospitals 361, 362, 363, 364) 91st "Wild West" division 316 Sup Tn 316th Supply Train, 91st "Wild West" division Organization Supply 316 TM 316th Trench Mortar Battery, 166th Field Artillery Brigade, 91st "Wild West" division Organization Trench Mortar 316 Tn HQ 316th Train Headquarters and Military Police, 91st "Wild West" division Organization HQ & MP 318 Engrs 318th Engineer Regiment, 6th division Organization Engineer 319 Engrs 319th Engineers, Services of Supply Organization Engineer 322 F Sig Bn 322nd Field Signal Battalion, ?

9 Organization Signal 323 Serv Bn 323rd Service Battalion, 7th division ? Organization Serv 328 Aero Sq 328th Aero Squadron, Air Service Organization Aero 333 Aero Sq 333rd Aero Squadron, Air Service Organization Aero 338 Inf 338th infantry Regiment, 169th infantry Brigade, 85th "Custer" division Organization infantry 339 Bn 339th Battalion, Tank Corps Organization Tank 339 Bn, Tank C 338th Battalion, Tank Corps Organization Tank 34 Balloon Co 34th Balloon Company Organization Aero - Balloon 344 FA 344th Field Artillery Regiment, 165th Field Artillery Brigade, 90th "Alamo" division Organization Field Artillery 345 Bn 345th Battalion, Tank Corps Organization Tank 345 Bn, Tank C 345th Battalion, Tank Corps Organization Tank 345 Inf 345th infantry Regiment,173rd infantry Brigade, 87th "Acorn" division Organization infantry 316 Engr Tn 316th Engineer Train.

10 91st division Organization Engineer 346th FA 346th Field Artillery Regiment, (75mm), 166th Field Artillery Brigade, 91st division Organization Field Artillery 346th MG Bn 346th Machine Gun Battalion, 91st division Organization Machine Gun 347 FA 347th Field Artillery Regiment ( "), 166th Field Artillery Brigade, 91st division Organization Field Artillery 347 MG Bn 347th Machine Gun Battalion, 181st infantry Brigade, 91st division Organization Machine Gun 348th Field Artillery Regiment (155mm) 166th Field Artillery Brigade, 91st division Organization Field Artillery 348th MG Bn 348th Machine Gun Battalion, 182nd infantry Brigade, 91st division Organization Machine Gun 35 Prov Sq 35th Provisional Squadron, Leneve, Oregon (103 Spruce Squadron) Organization Prov 350 MG Bn 350th Machine Gun Battalion, 183d infantry Brigade, 92nd "Buffalo" division Organization Machine Gun 361 Inf 361st infantry Regiment, 181st infantry Brigade, 91st division Organization infantry 362 Inf 362nd infantry Regiment, 181st infantry Brigade, 91st division Organization infantry 363 Amb Co, 316 Sn Tn 363rd Ambulance Company, 316 Sanitary Train (Amb Co 19, 91st division ) Organization Amb 363 Inf 363rd infantry Regiment, 182nd infantry Brigade, 91st division Organization infantry 364 Inf 364th infantry Regiment, 182nd infantry Brigade, 91st division Organization infantry 37 Bln Co 37th Balloon Company, Air Service, Signal Corps Organization Aero 37 FA 37th Field Artillery Brigade, Coast Artillery Command Organization Field Artillery 376 Inf 376th infantry Regiment?