Hello, lately I am listening to Overkill Feel The Fire - Coma era, and I am looking for some similar thrash bands, especially something like "Years Of Decay".

Thanks in advance.

Hallow's eve- Death and Insanity is fairly close to early Overkill. For something like Years of Decay i'd say Heathen's Victims of deception.

National Suicide

Tension's Breaking Point sounds like an album Overkill would have released in 1983/1984. A lot of traditional/USPM sound in it, but still thrashy.

Allright, early Mun waste, Nuclear Assault fo shiz, Sarcofago, Rigor Mortis, there's lots d00d.

Iron Angel maybe? I think their "Hellish Crossfire" probably fits what you want. I'll also mention Flotsam and Jetsam, Exumer, and Artillery.