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I couldn't find any date listed for that photo.
N165W is based out of BWI.
NG at BWI
Maybe this is the plane. Coordinates N39 11 3.89 W76 41 3.93 on Google Earth. The ES building is adjacent to the west. You can see the Northop Grumman sign for "entrance 2" using street view around
N39 11 5.34 W76 41 22.93 .
If you look at the wiki, you can see the division was owned by Westinghouse, hence that is why Westinghouse at one time owned the plane. The wiki has a number of projects listed for ES, not that this is particularly useful in helping us figure out what the plane is doing there.
NG ES wiki
Unfortunately, I don't think there are any mil-air monitors near the TTR, so it is unlikely anyone is going to catch a comm from the plane. [Note I presume the plane is still at the TTR. They didn't bother to block internet tracking, and it has no other flights logged.] There are people in Vegas that monitor Dreamland and Blackjack, so in the event the plane needs to use those frequencies, some post may show up on the Nevada or mil-air forum. Typically non-military aircraft enter the range via Dreamland (the Mercury tower) and once in a while directly with Nellis over Blackjack. But since this plane is at the TTR, I would guess if they need range time in a location other than the TTR, they would just fly south from KTNX.
You can search N165W on radioreference dot com. It has a few hits from a monitor in Maryland, but no real useful iinformation. I don't want to poach their website, but you can get a list of aircraft based as NG ES from this thread:
NG ES on radioreference.com
I'm going to look for NG press releases specific to Tonopah. It is possible they have done tests there in the past. That is, there may not be specific data related to N165W at Tonopah, but rather NG tests there.