Yes, they do, at least partially, but there are massive differences between countries.

Let’s add some data to this popular question, shall we? This is from our recent paper at the 36th Digital Avionics Systems Conference [1]. We collected ADS-B and Mode A/C/S data from over 6000 aircraft operated by militaries all over the world (with a strong focus on Europe/the US) using the The OpenSky Network. The key plot to answer the question is the following: