Our Medical Corps is especially entitled to praise for the general effectiveness of its work both in hospital and at the front. Embracing men of high professional attainments, and splendid women devoted to their calling and untiring in their efforts, this department has made a new record for medical and sanitary proficiency. [Sidenote: The Quartermaster Department.] The Quartermaster Department has had difficult and various tasks, but it has more than met all demands that have been made upon it. Its management and its personnel have been exceptionally efficient and deserve every possible commendation. [Sidenote: Ordnance Department, Signal Corps and Engineer Corps.] As to the more technical services, the able personnel of the Ordnance Department in France has splendidly fulfilled its functions both in procurement and in forwarding the immense quantities of ordnance required. The officers and men and the young women of the Signal Corps have performed their duties with a large conception of the problem and with a devoted and patriotic spirit to which the perfection of our communications daily testify. While the Engineer Corps has been referred to in another part of this report, it should be further stated that the work has required large vision and high professional skill, and great credit is due their personnel for the high proficiency that they have constantly maintained. [Sidenote: American aviators.] [Sidenote: The Tank Corps.] Our aviators have no equals in daring or in fighting ability and have left a record of courageous deeds that will ever remain a brilliant page in the annals of our Army. While the Tank Corps has had limited opportunities its personnel has responded gallantly on every possible occasion and has shown courage of the highest order. [Sidenote: Other Departments.] The Adjutant General's Department has been directed with a systematic thoroughness and excellence that surpassed any previous work of its kind. The Inspector General's Department has risen to the highest standards and throughout has ably assisted commanders in the enforcement of discipline. The able personnel of the Judge Advocate General's Department has solved with judgment and wisdom the multitude of difficult legal problems, many of them involving questions of great international importance. It would be impossible in this brief preliminary report to do justice to the personnel of all the different branches of this organization which I shall cover in detail in a later report. [Sidenote: Cooperation of Navy and Army.] The Navy in European waters has at all times most cordially aided the Army, and it is most gratifying to report that there has never before been such perfect cooperation between these two branches of the service.