Photo Number Eighty-One

This elderly couple look foreign to me..the photo folder has rifles on it. The photographer was ? G. Crawford, I did a quick search and found nothing that seemed to fit.  I love the kindly looking Grandpa's  hair.. I will guess that this is a 1930's photo.  This is still in the group of photos from South Dakota.
Thanks for stopping!  Do come again:)
Update** This is possibly Patrick and Mary Walls?? Will we ever know for sure? 
 Info from Abra:  
A little further research finds Mary Walls, widowed, age 50, in 1900, living in Tampico, Whiteside , Illinois. Her daughters, Agness (sic), 21, and May (sic), 19, are living with her, as well as a niece, Anna Murphy, age 16. The census shows that she is the mother to 4 children, of which 2 are living. Again, the ages are off compared to 1910 census, but Agnes’ age in 1900, matches up with what I found in 1920 & 1930. More searching reveals finds Mary Walls(28), married to Patrick Walls(34), living in Hahnaman. They have two children at this point, Ambrose age 4 and Agness, age 2, as well as a servant, Daniel Callehan (there are close neighbors with the Callehan surname, as well). Patrick is listed as a farmer. I find Patrick, age 23, living in Browning, Schuyler County, Illinois, occupation of R.R. hand (there were a lot of RR hands living in this particular neighborhood). The only thing I can’t explain with all of this is what the ‘uniforms & pins’ are for on the clothing in Mr. & Mrs. Walls previous photo.