Hackers using the handle @LulzSecPeru have announced an attack on the Argentina Ministry of Defense (https://www.mindef.gov.ar/) website today. First the announcement of the breach and defacement came > Ministerio de Defensa Argentina #defaced @thehackernews @cyber_war_news @eduardkovacs mindef.gov.ar — Lulz Security Peru (@LulzSecPeru) December 30, 2012
Shortly after another announcement was made that the rest of the document had been leaked. > @thehackernews @eduardkovacs @cyber_war_news > Mindef Documents ow.ly/gr6PH — Lulz Security Peru (@LulzSecPeru) December 30, 2012
The leaks are claimed to range from secret to top secret documents.
According to statements by the DEPARTMENT OF ARGENTINA DEFENSE the computer systems area say they had a system impossible to hack, thing turned otherwise. The event should not be taken as terrorism, was for the simple fact to prove that the system was totally vulnerable. The documents contain highly sensitive material rated SECRET (aircraft, submarines, guns).
The document leaks were uploaded to anon files and contain complete archive and database systems with heaps of files from the servers of the Ministry of defense. 
When uncompressed the total of files and databases is well over 300mb. At time of publishing i still had not had time to go over this data and considering its not in English text its going to make it a bit difficult to do so. Also the server related information from this breach was leaked to anonpaste.me