I've been looking at Sarge's hut and you can see military insignia all over the darn thing.
It's on the boxes, the door, etc.
And yes, I think there's a military texture or two in the playset somewhere.
And Sarge representing someone in our government?
I don't believe that for less then .00012 nanosecond.
I checked the Rank Structure, Sergeant is pretty low down the chain of command.
Considering it's only Generals (most likely the 4 star generals) who have direct contact with politicians, it means a Sergeant isn't connected to politics.
Maybe Disney thinks having actual armed forces representatives in the game is controversial, even if it's a retired soldier or a toy of a soldier.