These screen-shots are not in time-sequence and are, on the whole, rather boring. In the 3rd and 5th snapshot, you can see the mini-tanks, indicating remaining life. In the 3rd snapshot, an enemy tank has just fired.
We can see the HUD in all of the screen shots, wit all its elements. The sight should be obvious, the red dots represent objects in the world (all small dots are either immovables or missiles, the larger dots are enemy tanks). The green lines represent out FOV. All alert messages (at the moment, that is "INCOMING") appear well below the horizon, so as to interfer minimally with the business of hunting down and shooting enemy tanks.