Dear media...
The troops are not in Fort Bragg, NC. They are at Fort Bragg. This is a minor nit, but it bugs me. Mainly because it's far more common to refer to yourself being in a unit which is at a particular base. ("I was in the 1/15th at Schofield Barracks." for example.)
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I mean, you could technically consider something, say the political party membership of troops/soldiers (which is generally irrelevant to military units) in Fort Bragg but the training of troops at Fort Bragg would be a different thing completely.
The difference--perhaps--may be how we're "collecting" troops into a "container". Your illustration: "I was in the 1/15th at Schofield Barracks." sort of shows this. The "container" of 1/15th Infantry holds troops (individual soldiers) while the "container" Schofield Barracks holds units which are colloquially known as "troops".
I guess one way to think about it is whether or not all the "items" talked about are physically in the "container". For a unit, you always have someone on leave or TDY for training or something, so the unit would be at a post while the individual members may not. However, if you're only talking about those physically present...
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