No, in WWII the one as a Patch could be worn, as well as the matching pair with Andy Jackson, the one I posted was just made  in the mid  to late 60s early 70s, you will see these with 1930s 1850s hallmarks,   Its the one from when the 30th was downgraded to a brigade size organization in 1974 that will of course not be worn in WWII.

I believe both of these would be circa 1912-1919 manufacture, mainly due to the left one lacking hallmarks. The left appears to be an early unmarked NS Meyer. The right emblem appears to possibly be JR Gaunt, with one main concern. Of course this is just speculation, but from my observations, all of my hallmarked examples from Gemsco have the stabilizing pin without a circular base. While many used similar dies with minor variations, the fouling of the rope, under the stock vs over the stock, twist rate etc. was left up to the manufacturers finisher. I tend to see the higher quality emblems have a much higher twist rate and the fouling, I personally refer to it as a Z stock , is found on earlier Gaunt birds. The main concern for its possibility to not be a Gaunt would be the size of the bronze retaining cylinder. Gaunt emblems tend to use a very long retaining cylinder, while this one is short. My 2 cents. 

. WWII documentary covering Alan Whicker serving with the British Army Film Photo Unit  ( AFPU )   Post War Whicker was a regular BBC television world correspondent reporting from virtually every country in the world, he covers the war from Sicily up Italy to the wars end, covering Sicily, Anzio, Rome, Palermo,  Heavily photo and video loaded with background story of these images, lots of his images are well known World War Two images.  A two part documentary featuring many Then and Now images of where he was based during the war and again visiting the same places for these documentaries.   At the end of the second documentary he took the surrender of an SS unit and the hand-over of the SS safe containing the wages of this particular SS unit.    https://www.youtube.com/watch?v=7wjw-g_CGkk   https://www.youtube.com/watch?v=nIHeJ-kE2YI       Norman D. Landing, Forum Normandy Correspondent, 03 May  2O26.   ..        

Very cool stuff I have some hbt with same ssi 

SSI on left shoulder is the soldier's current unit of assignment. SSI on right shoulder is the soldier's unit in a designated combat or hazardous overseas duty location. While some details of the applicable Army regulation have changed, it's been essentially the practice since WW2.

.       https://www.youtube.com/watch?v=duZlWWwxIPQ     Norman D. Landing, Forum Normandy Correspondent, 03 May  2O26.   ..  

@patches Thank you for your help. So only the unit insignia type DUI could have been worn during ww2 the other two not.   Regards,   Remi

Interesting cache of shirts I found 2nd infantry 5th army.  Can anyone help me understand what this guy would have been doing under combined unit  2nd infantry div with 5th army ?       

Interesting cache of shirts I found 2nd infantry 5th army.  Can anyone help me understand what this guy would have been doing under combined unit  2nd infantry div with 5th army ?     

Hello! Curious if anyone has an idea on the value of this insignia? Thanks!