Sentence:  Even though the relationship between the Information Troops and the existing <WSD>REB</WSD> Troops is not completely clear, <WSD>REB</WSD> Troops were one of the few elements of the Russian forces whose performance did not suffer intense cricisism / [note] <WSD>REB</WSD> Troops are the "Voyska radioelektronnoy bor'by", or Voyska <WSD>REB</WSD> — the Russian military's electronic warfare branch. 
Meaning of the word marked with <WSD> tags:  electronic warfare and related techniques, equipment, or troops.