Need help identifying the gas masks in this photograph, 366th Infantry

[ColWestnedge]

I was hoping that someone on here would be able to help me confirm what type of gas masks these 366th Infantry soldiers are wearing in the photograph attached to this post. I'd like to thank World war I nerd for their amazing thread on AEF gas masks. What a fantastic resource. It appears to me, from reading that thread, that the left-most soldier in the picture is still wearing a British SBR mask while the two soldiers next to him are wearing CEM masks. I am basing my analysis off what world war I nerd said in post #53 of the AEF Gasmasks & Respirators 1917 to 1919 thread. I would love it if any of you could confirm or suggest other alternatives.

Thank you!

[AustinO]

Here is a closeup taken from the LOC's copy. The men are of the 3rd Battalion 366th Infantry, photo taken 8/8/1918:

https://catalog.archives.gov/id/55211378