The Pentagon has announced a major expansion of its cyber army to defend national infrastructures, as well as to empower offensive computer operations against hostile states. The US and Israel are considered in cyber warfare context most advanced countries, according to international specialized press they have been involved in the creation of the first worldwide recognized cyber weapon, Stuxnet. US government has decided an increase of 4000 units for the Defense Departments Cyber Command, considering that actually the Command is composed by 900 specialists.”]
Source: https://securityaffairs.co/wordpress/12070/security/how-the-us-are-preparing-to-cyber-warfare.html