So, although it is pretty clear that Trump made a focus on Veteran's issue a top campaign theme, and during the General Election, it is less clear to what extent this had an electoral impact....
In an attempt to look at this question at more of a Micro level, I pulled data for the % of the population by county by State.
Now, this in no way shape or form can be considered a fundamental study on US Military Veterans voting patterns in the '12 & '16 Presidential elections.
The reason for this is simple and straight-forward. Many Vets live in large population centers, which account for a large chunk of the US Population, and frequently in places with a high level of population growth, so LA County for example has a ton more Veterans than the population of Vets in most of the counties on the list below combined.
Still, by looking at the County level numbers for places with the highest % of Vets, it helps give us an idea of where and how much Trump's appeal to Vets, may have played a factor in the '16 Election Outcome.
This is the source that I used for my data files, which I was able to convert into an Excel format, or if not from another source and did some spot checks to see if the % of Vets matches by County....
http://www.economicmodeling.com/2017/03/21/share-veterans-every-county/I'm not sure if the data set includes a % of Vets of the total county population, or just the 18+ ages which can obviously skew results.
Many of the "Top Vet County by State" appear to overlap with US Military Installations, so again the methodology employed (Are active duty counted in these numbers or just retired Vets???)
So--- let's get started with a list (will try to include military installation if possible):
AL: Dale-- 13.2% Vet-- (Fort Rucker)--'16: (24 D- 74 R); '12: (28 D- 70 R) +8% R Swing
AZ: Cochise- 14.6% Vet-- (Fort Huachua)- '16: (35 D- 56 R); '12: (38 D- 60 R) +1% D Swing
AR: Marion- 13.6% Vet--- (N/A)--- '16: (20 D- 75 R); '12: (29 D- 68 R) +16% R Swing
CA: Sierra- 15.2% Vet--- (N/A)-- '16: (32 D- 56 R); '12: (36 D- 59 R) +1% R Swing
CO: Custer- 16.3% Vet-- (N/A)-- '16: (26 D- 67 R); '12: (32 D- 66 R) +7% R Swing
CT: New London- 9.0% Vet- (Naval Sub) '16: (50* D- 44 R); '12: (58 D- 40 R) +12% R Swing
DE: Kent- 11.0% Vet- (Dover AFB)- '16: (45 D- 50_R): "!2: (52 D- 47 R) +10% R Swing
FL: Sumter- 16.0% Vet--- ("The Villages)--- '16: (29 D- 68 R); '12 (32 D- 67 R) +2% R Swing
GA: Liberty- 15.8% Vet- (Fort Stewart)-- '16: (59 D- 38 R); '12 (65 D- 34 R) +10% R Swing
HI: Honolulu- 8.1% Vet (Marine Corp Base)- '16: (61 D- 32 R); '12: (69 D- 30 R) +10% R Swing
ID: Elmore- 17.9% Vet (Mtn Home AFB)- '16: (21 D- 68 R); '12: (31 D- 65 R) +13% R Swing
IL: St. Clair- 10.5% Vet (Scott AFB)-- '16: (50* D- 44 R); '12: (56 D- 42 R) +8% R Swing
IN: Brown- 11.5% Vet (Camp Atterbury)- '16: (32 D- 63 R); '12: (40 D- 57 R) +14% R Swing
IA: Lee-- 9.7% Vet-- (N/A)--- '16: (38 D- 55 R); '12: (57 D- 42 R) +32% R Swing
KS: Morris- 13.5% Vet- (Ntl Guard?)-- '16: (23 D- 69 R); '12: (28 D- 69 R) +5% R Swing
KY: Meade- 13.9% Vet- (Fort Knox)-- '16: (25 D- 71 R); '12: (38 D- 61 R) +23% R Swing
LA: Vernon- 13.2% Vet- (Fort Polk)-- '16: (16 D- 81 R); '12: (20 D- 78 R) +7% R Swing
ME: Piscataquis- 11.5% Vet-- (N/A)-- '16: (34 D- 59 R); '12: (46 D- 51 R) +20% R Swing
MD: St Mary's- 10.5% Vet- (Naval Air Pax Rvr)--'16: (35 D- 58 R); '12: (41 D- 56 R) +8% R Swing
MA: Barnstable- 9.4% Vet (Joint Base Cape Cod)-'16: (53 D- 40 R); '12: (53 D- 45 R) +5% D Swing
MI: Keweenaw- 16.1% Vet- (AF Stn)- '16: (37 D- 57 R); '12: (42 D- 56 R) +6% R Swing
MN: Aitkin- 12.8% Vet- (N/A)--- '16: (34 D- 60 R); '12: (48 D- 50_R) +24% R Swing
MS: Harrison- 10.6% Vet- (AFB/Naval)-- '16: (33 D- 64 R); '12: (37 D- 62 R) +6% R Swing
MO: Pulaski- 13.6% Vet- (Ft Leonard Wood)- '16:(22 D-73 R); '12:(31 D-67 R) +25% R Swing
MT: Mineral- 14.8% Vet- (N/A)- '16: (26 D- 66 R); '12: (35 D- 60 R) +15% R Swing
NE: Hayes- 13.6% Vet- (N/A)- '16: (6 D- 92 R); '12: (9 D- 88 R) +7% R Swing
NV: Mineral- 16.1% Vet- (Army Depot)- '16: (32 D- 59 R); '12: (42 D- 53 R) +16% R Swing
NH: Carroll- 11.0% Vet- (N/A)- '16: (44 D- 49 R); '12: (49 D- 50_R) +4% R Swing
NJ: Cape May- 8.4% Vet- (USCG)- '16: (38 D- 58 R); '12: (45 D- 54 R) +11% R Swing
NM: Sierra- 16.4% Vet- (White Sands)- '16: (31 D- 58 R); '12: (38 D- 57 R) +8% R Swing
NY: Hamilton- 13.0% Vet- (N/A)-- '16: (29 D- 64 R); '12: (36 D- 62 R) +9% R Swing
NC: Camden- 14.1% Vet- (USCG-Air)- '16: (25 D- 71 R); '12: (32 D- 66 R) +12% R Swing
ND: Griggs- 10.1% Vet- (N/A)--- '16: (24 D- 67 R); '12: (40 D- 57 R) +26% R Swing
OH: Greene- 10.2% Vet- (Wright-Pat AFB)- '16: (35 D- 59 R); '12: (39 D- 60 R) +3% R Swing
OK:Comanche- 12.9% Vet- (Fort Still)- '16: (35 D- 59 R); '12: (41 D- 59 R) +6% R Swing
OR: Curry- 14.6% Vet (N/A)--- '16: (34 D- 57 R)- '12: (40 D- 57 R) +6% R Swing
PA: Sullivan- 12.6% Vet- (N/A)- '16: (24 D- 73 R)- '12: (35 D- 63 R) +21% R Swing
RI: Newport- 9.6% Vet- (USCG & Navy)- '16: (56 D- 37 R); '12: (59 D- 39 R) +1% R Swing
SC: Sumter- 11.3% Vet- (Shaw AFB)- '16: (55 D- 43 R)- '12: (58 D- 41 R) +5% R Swing
SD: Fall River- 14.1% Vet-- (N/A)-- '16: (23 D- 70 R); '12: (32 D- 64 R) +15% R Swing
TN: Montgomery- 12.9% Vet- (Fort Campbell)- '16: (38 D- 56 R); '12: (44 D-54 R) +8% R Swing
TX: Lampasas- 15.3% Vet- (Fort Hood)- '16: (18 D- 78 R); '12: (21 D- 78 R) +3% R Swing
UT- Piute- 12.1% Vet- (N/A)- '16: (6 D- 86 R); '12: (9 D- 89 R) +0 Swing
VT- Essex- 10.6% Vet- (N/A)- '16: (35 D- 51 R); '12: (55 D- 42 R) +29% R Swing
VA- York Co- 14.4% Vet- (Fort Perry and USN)- '16: (38 D- 55 R); '12: (39 D-60 R) +4% D Swing
WA-Island- 15.6% Vet- (Naval Air)- '16: (47 D- 42 R)- '12: (51 D- 46 R) +0% Swing
WV-Greenbrier- 10.0% Vet- (N/A)- '16: (26 D- 67 R); '12: (36 D-61 R) +16% R Swing
WI- Florence- 12.4% Vet- (N/A)- '16: (25 D- 71 R); '12: (36 D- 63 R) +19% R Swing
WY- Johnson- 11.8% Vet- (N/A)- '16: (14 D- 79 R)- '12: (18 D- 79 R) +4% R Swing
So the 'Pub % of 'Pub for these counties by state in '16 would look like the following....