Another interesting excerpt from John Sayen’s Battalion: An Organizational Study of United States Infantry currently being serialized on Bruce Gudmundsson’s Tactical Notebook discusses the role of the US Marine Corps on the Western Front as part of Pershing’s AEF:

“How Twenty Marines Took Bouresches” by Frank E. Schoonover.
Originally published in the Ladies’ Home Journal Vol. 24 No. 1, via Wikimedia Commons

The Fifth Regiment arrived in France in July 1917. Being the fifth regiment of a four-regiment division, it soon found itself relegated to the sidelines and stuck with all the odd jobs such as providing military police details, couriers, and guards. Correctly reasoning that a larger unit would not be so easily pigeonholed, General Barnett [the Marine Corps Commandant] in October 1917 augmented the Fifth Regiment with the newly formed Sixth Regiment and Sixth Machinegun Battalion. The whole force constituted the AEF Fourth Brigade, or half the infantry of the AEF 2nd Division.*

Although the organization of the Fourth Brigade’s infantry regiments was supposed to be the same as that of all the other AEF infantry regiments, it did in fact differ in some details (see Appendix 2.6). Every Marine rifle and machinegun company had two additional sergeants to serve as gas NCOs and the Marines added gas officers to each battalion headquarters. Whether this helped reduce the number of gas casualties is unclear.

Marine enlisted men also tended to be given higher ranks than their Army counterparts. In a Marine regiment a platoon sergeant was not just the senior sergeant in a platoon, he was a gunnery sergeant, ranking as an Army sergeant first class (a rank that the Army awarded only to specialists) and well above a sergeant. Sergeants commanded all four sections in a Marine rifle platoon and this allowed an additional sergeant per half-platoon. The rifle section included two men trained equipped as snipers (enough for one sniper per half-platoon). Two more snipers were in company headquarters. Since 1887 when test results had exposed their poor marksmanship, the Marines had made rifle shooting into even more of a fetish than it had been in the Army. In contrast to the many soldiers sent into battle without even having fired their rifles, no Marine was even allowed overseas if he had not qualified as an expert rifleman or sharpshooter.

To give extra promotion, pay, and recognition (but not leadership responsibility) to the best shots the Marines introduced the rank of corporal (technical). The rank was also given to mechanics, horseshoers, saddlers, teamsters, and five senior operators in the telephone section of the regimental signal platoon to reward technical proficiency. However, despite their important but difficult and thankless duties, Marine cooks only ranked as privates.

[…]

The Marine AEF regiments differed from their Army counterparts in more than just structural details. They had a huge advantage in manpower quality. Except for about 7,100 draftees accepted during the war’s last weeks, the nearly 79,000 Marines who served in the war were all volunteers. About one sixth of these men had joined prior to the war. This was several times the Army’s percentage of pre-war men, even if those who had only National Guard service are included. Many Marine wartime volunteers were college men and included a lot of athletes.

The large number of officer-quality enlisted men persuaded General Barnett to direct on 4 June 1917 that, in future, all officers be appointed from the ranks. This move had the strong backing of Secretary Daniels who favored the practice of commissioning enlisted men. Such a system would be more in line with what the Germans and French were doing. Even the college men would have to have several months’ enlisted service before they could hope for a commission. By then their leadership potential could be properly evaluated. In addition, many pre-war enlisted men of greater age and experience but less education and growth potential could also become officers. Better still, the Marines were mostly infantry. Unlike the Army, they had few service or technical positions into which their best and brightest could be drained. Instead of getting the dregs, Marine infantry regiments got all the best officers and men. They were always kept at full strength with fully trained replacements, despite heavy casualties.**

The high quality men that the Marines were able to contribute to the AEF provoked a good deal of jealousy within the Army in general and from General Pershing in particular. The latter praised the Marines in private but refused to do so in public. Although Pershing had accepted the Fourth Marine Brigade into the AEF, he rebuffed every offer to send Marine artillery to France. The presence of both Marine infantry and artillery in France would have paved the way for the formation of a Marine AEF division. That would have given the Marines much more publicity at Army expense.

Late in the war Pershing relented enough to accept another Marine infantry brigade, the Fifth, which reached France in September 1918. However, although nearly all these Marines had qualified as expert marksmen, he employed them in menial jobs in the rear areas. At the same time, Pershing was rushing thousands of untrained Army recruits into front line combat where they were routinely and needlessly slaughtered.***

* Major David N. Buckner USMC, A Brief History of the Tenth Marines (Washington DC, Historical Div. HQMC; 1981) pp. 16-17.

** Heinl pp. 191-228; and J. Robert Moskin, The Story of the U.S. Marine Corps (New York, Paddington Press Ltd. 1979) pp. 138-139; LtGen William K. Jones USMC(Ret) A Brief History of the 6th Marines (Washington DC, History and Museum Div. HQMC 1987) p 1.

*** Heinl pp. 194-195 and 208-210; Allan R. Millett, Bullard op cit p. 321.