Qajars were an Azerbaijani dynasty which ruled Iran until 1925, which really isn't even a century ago. But let's also take a look at their military.
Some history lesson for Persians here, it was not even a century ago...
"The majority of infantry troops were of Turkish-speaking origin, with 26 regiments of Azeris from Azerbaijan and 16 regiments of Turkish-speaking recruits drafted in other provinces
. Kurds and Lurs provided 8, and Persians the remaining 30 regiments
(Picot, p. 112)."
Encyclopædia Iranica | Articles
Keep in mind that Persians had a much larger population, yet Azeri Turks dominated the military. Also, Azeris lived in other provinces aswell, so those 16 Turkic-speaking regiments from other provinces surely included Azeris (probably even most of them).
That statistics (from official documents) does not include artillery and cavalry, which were mainly made up of Azeris, if not exclusively
"Azerbaijan was the historical recruiting ground for the artillery"
Qajar basic military terms was in Azerbaijani language. Tufgenchi = Musketeer, Topchu = Artillerymen.
I would not even talk about Safavid era...Azerbaijani language was sole military language of Safavid Empire, so go figure.