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George's marriage record from 1912 that was mentioned above is here - https://www.familysearch.org/ark:/61903/3:1:939Z-BJL4-7?view=index&personArk=%2Fark%3A%2F61903%2F1%3A1%3AXL4Q-CDW&action=view 

The Veterans Affair index shows that he was in the military from 6 April 1917 to 19 April 1919.  https://www.familysearch.org/ark:/61903/3:1:3Q9M-C3MW-CQBD-S?view=index&personArk=%2Fark%3A%2F61903%2F1%3A1%3AW7KC-NT3Z&action=view  The earliest registration for WWI draft in the US was 5 Jun. 1917, so he would have already been in then.

George was quoted in a Los Angeles newspaper about his predictions for the war.  https://cdnc.ucr.edu/?a=d&d=LAH19181028&dliv=userclipping&cliparea=1.4%2C1448%2C2469%2C665%2C1557&factor=4&e=-------en--20--1--txt-txIN-george+slatford-------

In the Massachusetts marriage index, there are entries for John J. Ford and Ann M. Linehan on the same page and volume for Boston in 1941. 

She also did not show up in this database for rural areas of McLennan Co. - https://mclennancountytx-web.tylerhost.net/web/search/DOCSEARCH392S6

New York didn't require statewide vital registration until 1881, so there likely is no death certificate.

2 Sep 1977: Name listed as JOHN D HOLMES

In case you didn't already know, this doesn't mean he was alive in 1977.  It's just something that the Social Security Administration did to check its systems.  My father has something similar on his entry that was from 7 years after he died.

There's a bit of a lapse of online Michigan death records.  They have through 1952 for the state and 1953 for Wayne Co., and then it starts up again in 1971.  Good chance that John & his wife died in that time frame.