The US Army website was attacked by the Syrian Electronic Army after which they had to take the website offline temporarily.
The hackers hacked the websites and displayed some messages on its social media containing claims of attack.
This type of attack could affect the national economy and can cause enormous threats.
Source: https://blog.itgovernanceusa.com/blog/us-army-website-hacked
"id": "USA185930422",
"linkid": "us-army",
"type": "Cyber Attack",
"date": "06/2015",
"severity": "100",
"impact": "9",
"explanation": "Attack that could bring to a war"