WM, the tests for those diesel generators would have mainly been for CO rather than Nitrogen Oxides. That is a relatively new thing. Also even if the RAF were aware of the NOx problem, they would also have been aware that it mainly attacks older people with respiratory issues and is unlikely to have a major impact on younger people, of which the RAF is full.
The black carbon is an issue, but that, as you say, is better controlled with pump and injector settings.
For VW this was a very different thing. They had a second string engine with second string performance and high emissions. They were competing in a world where PSA have the best diesel in the world with the lowest emissions and best performance in the size/class.
VW had a choice. They could have thrown billions into R&D, taken the hit on Diesel car sales in the short term and, eventually, come out the other end with a leader in engine class and performance which PSA would not have had either the R&D ability or the simple money resources to compete with. Instead they chose to lie. It may have been a short term lie (as they saw it), but it was still a pretty big porkie lying out there.
Notably all the other cars tested have larger engines with better power performance and worse fuel economy than the 2.0 turbodiesel range. That includes VW. In fact VW can only reach the emissions requirements of the EU and the US via their most highly tuned and highest performing engine.
Of course this state of affairs as it was back in 2008, was not one VW wanted to continue. So what did they do? They "Ging nach vorne durch Lügen". Which is the literal translation of walked forward through lies....
It's not the first time this has happened in Germany. Hitler is quite famous for painting lead with liquid gold and saying to everyone "hey we have reserves". Granted this is the confidence trick of a fiat currency but it is along the same lines. If you can't tell the truth, tell a convincing lie until it doesn't matter any more. why nobody called VW's bluff and said "Ok so how does this wonderful new technology work which makes your engines simultaneously perform better than the old one and also emit less harmful emissions?". VW traded on it's reputation and the authorities let them. That's going to hurt everyone.
So down to brass tacks and why it's so bad. This was a concerted attempt to not only to circumvent the regulators in an attempt to avoid R&D costs so they could sell more cars; it was a direct and malicious attempt to steal market share from car manufacturers, damage their revenues and profits and, if possible, drive them to the point where they might need a merger with another car manufacturer to survive.
So the simple one. Every car manufacturer in the world has the right to sue VW for loss of income.
In the US, not only did they say that they had vehicles which outperformed everyone else for a reasonable price, but they had massive marketing campaigns to try and convince the people that only by buying VAG vehicles would they get the modern and advanced technology of Germany that would allow them to pollute less and cut costs on their car ownership.
So, now, not only does the US government have them for systematically and deliberately using "technology" to lie to the regulators in order to pass off older and dirtier technology as more modern and better than US technology; not only do they have them for running a massive marketing campaign to present these lies as the truth; not only do they have them for damaging the US car industry to the tune of half a million cars; BUT. Every citizen in the US who bought one of these cars, every dealership stuck with them and every citizen who did not buy an American car, which might have been cheaper and on offer, has a right to bring a class action suit against them. Over and above the federal government fines and legal action from just about every state in the US.
Then we get into the even murkier parts. More than 20% of the VW group is owned by German government. Which means that what VW did was also state sponsored anti competitive marketing against the markets of another country, in direct contravention of god knows how many WTO treaties signed.
Then we have Spain who sponsored every new "clean" VW, on the basis of their so called "emissions profile" to the tune of €1,000 per vehicle. All 1 million of them. So now they are demanding that VW return €1bn in subsidy costs and that is before VW fixes the mess, compensates the owners and tries to polish the tarnish out of their reputation.
The top search I found on google UK today when trying to find the correct terminology for the emissions was....
VW Emission Class Action - CarEmissionsLawyers.co.uk
Adwww.caremissionslawyers.co.uk/
We Are Bringing Claims Now For VW, Skoda And Audi Owners
If VW emerges from this as a company which is anything like the one which went into it I will be highly surprised....