[quote=FhexSans]
[quote]And in both places, the T-45d should be RARE. The T-51b was the mainstay, its a much better platform, and in taking the T-45 down to almost non-existence, you can emphasize what quality of power armor troops the NCR is sending to Nevada. It's profound act of understatement.[/quote]
Just because the T-51b system replaced more T-45d suits in service doesn't necessarily qualify that they've become more rare than the T-51b in the wasteland. Chances are, the outdated T-45d suits would have been stored or had begun to be scrapped for parts. Given that there was only maybe a two year period between when the T-51bs were introduced and that T-45ds were prevalent, they could not have been completely phased out less completely destroyed in that time. At most, they might have been stored into warehouses all across the U.S. and perhaps parts of Canada as well, which would imply that they might be more common instead of less. I'd actually imagine you should see more of them lying about, but you should not see that many people using them because of their heavy reliance on small energy cells.
The one thing I do believe should be addressed is the complete lack of Advanced Power Armor (i.e. Remnants Power Armor) in NV specifically. I would think that either the NCR or the Brotherhood would have gotten their hands on at least some of the suits that the Enclave left behind after they both defeated them at Navarro, especially since the Advanced Power Armor apparently makes T-51b suits obsolete.
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^ This. T-45d was deployed 9 years before T-51 was even made. That means that T-45d (being able to stomp face) was likely set to mass produce (IE Sherman tank, not the best, but it worked and was easy). Therefore, by the time the T-51b made it to the front line likely hundreds of thousands, if not millions, had been produced. http://fallout.wikia.com/wiki/Power_armor
I had never actually considered the NCR using PA, didnt think much past the Salvaged PA that they already have. In fact, it almost makes sense that they dont have PA, (also this assumes that killing someone with PA and being able to get a full suit is ridiculous...which it is, but damn it makes me money.) because if you kill someone in a tank, most likely that tank is out of service, can parts be salvaged? yes, are you ever going to find a fully working tank? more than likely, are you ever going to piece together a fully functional tank from spare parts? not really.