Prosecutors said Tony Stigsson had jeopardised state security in taking classified defence documents home with him.
He was arrested in 2005 on suspicion of having beaten and raped his former wife. During a search of his home, police found the top secret military documents.
The court found that although the documents were not stored according to the armed forces’ rules, no information from the papers had been disclosed and therefore his actions could not be considered criminal.
Stigsson was initially suspended from his position during the on-going trial but was recently dismissed in April this year.