Our Philippine Scouts (from the late 'teens up to 1942) were essentially U.S. WW1 Doughboys gear-wise but in a tropical setting. Philip's latest post reminded me of these two pics. These are from a 2ID (Indianhead Division) site.
I particularly liked the rear view showing the M1910 haversack in both marching (1,2,4,5) and fighting (3) "order."
Addendum: The meat can pouches (usually referred to as "messkit pouch") in rear pic 2 and 4 are the first pattern laced-on type (compare with the wartime production fastened-with-webbing-strap type pouches). This first-pattern type pouch differed in both the shape of the cover flap and the method of fastening to the main pack. Just noticed after posting.
This post was helpful to me in answering a reference request for a patron. While working on the request I came across the caption for the photograph:
10900 [216A8]. Same as 10901. 10901 [215ASJ. Five United States soldiers — three Marines and two Infamtrymen (left to right) : F. Dochter, Thirtieth Company, Fifth Eegiiaent, Umited States Marine Corps; H. T. Johnson, Company L. Twenrty-eighth Infantry ; E. M. Stoneham, Thirtieth Company, Fifth Regiment, United States Marine Corps; William H. May, Company G, Eighteenth Infantry ; Corpl. Cecil E. Laws, Thirtieth Company, Fifth Regiment, United States Marine Corps. Jardin des Tuileries, Paris, France. April 20, 1918.]