The Section left Paris for May-en-Multien on June 19, 1917. On June 29 it left the training-camp, and took over its cars at Cramaille. It then went to Armentières, where, on July 6, an order came to join the 154th Division near Craonne. After two days on the road, with an overnight stop at Châtillon-sur-Marne, it arrived at Glennes, where it commenced work evacuating to base hospitals in the rear, with service at Beaurieux, Cuiry, Meurival, Fismes, and Romain, Saint-Gilles, and Courlandon. On July 18 it proceeded back from the lines, and on July 29 arrived at Chelles en repos. On August 13 it left for the Aisne front, going by Betz, Villers-Cotterets and Ressons-le-Long. On August 22 it was stationed at Villa Albert, in Soissons, with postes at Boulloy, Pont Rouge, Neuville, and Montgarni, with reserve postes at Chivres, Perrier, and Clamecy. It was enlisted in the U.S. Army on September 4 and became Section Six-Twenty-Four.

SECTION SIXTY-SIX began, after a period at May-en-Multien, at Cramaille. It moved on July 4 to Glennes, with Beaurieux as field headquarters, and worked the postes at the Moulin Rouge, Oulches, Flandres, and Village Nègre, and evacuated to Saint-Gilles, and Meurival. Then followed a repos near Château-Thierry, and moves to Nesle and Villomé in that neighborhood. On August 23 it moved north of the Aisne to Cuiry-les-Chaudardes, working postes at Monaco, Aurousseau, and Craonnelle, just under the Chemin des Dames. It was enlisted during September, 1917, in the U.S. Army Ambulance Service and subsequently became Section Six-Twenty-Three.

SECTION THIRTEEN left Paris in March, 1917, going first to the Champagne, where it took part in the great French offensive of April. In May the Section worked the poste at Mont Cornillet, where it received the first Army citation given to any Field Service Section. In June it moved to Sainte-Ménehould, thence to Verdun. It was working on the right bank of the Meuse when taken over by the American Army, becoming Section Six-Thirty-One.

SECTION THIRTY-THREE left for the front on August 16, 1917, the last Field Service Section to go out. It went via Bar-le-Duc to Issoncourt, and on September 6 to Triaucourt to join the 26th Division. The Section was enlisted on September 25, and the next day went to Grange-le-Comte, and shortly afterward to Clermont-en-Argonne. Early in November it became Section Six-Forty-Five in the U.S. Army Ambulance Service.

SectionThree was organized in Paris in April, 1915, and sent to the French Seventh Army for trial. Within a fortnight it was assigned to duty in reconquered Alsace.
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With the beginning of the autumn of 1916, it was decided, owing to the request of the French Government for a section such as had been able to work in the mountains of Alsace, to send SECTION THREE to the Balkans with the French Army of the Orient. Consequently it was ordered to Marseilles, sailing for Salonica October 20, and arriving in that city the 28th. In November the Section was assigned to the Monastir sector. Several times cars were detached and sent over into the wild, mountainous country of Albania to serve French troops there, and on one occasion the whole Section was sent to Greece with the French force ordered there to maintain Greece's neutrality. The Section remained in the Balkans until October, 1917, when the United States Army took over the Field Service work. The United States, not being at war at that time with Austria, Bulgaria, or Turkey, the War Department was unwilling to take over the Field Service work in this region. The personnel of the Section was obliged to return to France, but the material was turned over to the French Army of the Orient in order that this much-needed work might continue. It is interesting to note that the cars of the two Balkan sections were still in service during the last great advance which ended the Balkan campaign.

SECTION TWELVE left Paris on February 7, 1917, bound for Bar-le-Duc. It stopped first at Longeville, then at Vadelaincourt and Jubécourt. With Dombasle as its base, the Section worked Esnes and the Bois d'Avocourt. It was at the former place the Section first saw action. Twelve later worked in the Sainte-Ménehould, Suippes, and Châlons sectors. It was at Vaux-Varennes, its next and last move as Section Twelve, in a château located in a valley surrounded by the high hills of France, that it was taken over by the American Army, thereafter to be numbered Six-Thirty of the U.S.A. Ambulance Service.

SECTION TWENTY-EIGHT left Paris June 17, 1917, arriving at Mourmelon-le-Grand, in Champagne, in the sector of the Monts, June 19. It served with its division in line there until relieved in the fall. The postes along the Voie Romaine and out towards Mont Sans Nom and Mont Haut, were Ham, Bois Sacré, M Quatre, and Village Gascon. In mid-September the Section moved to Damery, where it was enlisted in the U.S.A. Ambulance Service as Section Six-Forty.

SECTION TWENTY-NINE left Paris on June 30, 1917, and going by Châlons and Bar-le-Duc, reached Condé-en-Barrois on July 2. On July 23 it went to Ville-sur-Cousances (Meuse) and served the postes of Esnes, Dombasle, and Bois de Béthelainville. It evacuated to the hospitals of Brocourt and Fleury-sur-Aire. On August 22 it left Ville-sur-Cousances for repos at Menil-la-Horgne. On September 2 it went to Saint-Mihiel, serving postes at Belle-Vallée, Marcaulieu, Village Nègre, Pierrefitte, and Villotte. On October 17 it went en repos at Silmont-en-Barrois, and on October 26 it moved to a cantonment at Belrupt, Chaume Woods, and served at Carrière d'Haudromont, near Verdun. It was at this time that the Service was militarized and the cars of Section Twenty-Nine were taken over by members of old Section Seventy-One to be known thereafter as Section Six-Forty-One of the U.S.A. Ambulance Service.

SECTION TWENTY-SEVEN left Paris for the front on June 9, 1917, going via Châlons-sur-Marne to Billy-le-Grand in the Champagne district. Its postes were at La Plaine, Esplanade, and Prosnes, and it evacuated from Villers-Marmery and from Mont-de-Billy. At the end of the month the Section went to Breuvery, south of Châlons en repos. Its next move was to Fontaine-sur-Coole, thence to Mourmelon-le-Grand, with postes at Ferme de Constantine, Ferme de Moscou, and Ludwigshafen. The Section then went back en repos at La Chaussée-sur-Marne and ended its existence shortly after resuming active service in the region of Suippes, where the Section was combined with old Section Seventy-Two, to be known thereafter as Section Six-Thirty-Nine of the U.S.A. Ambulance Service.

SECTION TWENTY-SIX left Paris on May 28, 1917, going by Montmirail to Souhesme. On June 17 it left for Camp Chiffour, east of Verdun, where it served at the front the postes of Ferme Bellevue, near Fort de Tavannes, Douaumont, and Chevretterie. The later cantonment was at Ancemont. It served hospitals at Souilly, Petit Monthairon, Rambluzin, Benoite Vaux, Dugny, and Vadelaincourt. The Section worked in this sector during the entire time before it was taken into the American Army. Its cars were then taken over by the personnel of Field Service Section Sixty-Nine which later became officially known to the U.S. Army as Section Six-Thirty-Eight.

To continue in Alsace the work of Sections Three and Nine in December, 1916, the Vosges Detachment of six ambulances went to Willer. There the Detachment remained for eight months attached to the 52d French Division, and serving the mountain postes of Mittlach, Larchey, Thann, Hartmannsweilerkopf, etc. In August, 1917, the men and cars were returned to Paris, and the Vosges Detachment as a separate unit was disbanded.