Cybersecurity has vexed the government ever since ENIAC — the first-ever electronic computer, which was used by the Army in the 1940s — first coughed into life and got a bug in one of its relays.

In recent years, the cyber threat has become a real national security concern and the Defense Department has responded in kind, hammering out a doctrine declaring cyberspace to be a fifth domain, alongside the traditional land, sea, air and space.

The Pentagon announced the creation of a U.S. Cyber Command in 2009 and the command reached full operational capacity in October 2010. It's matched by similar command functions in each of the armed services.

For a progress report on how the military is combating the cyber threat and a look at the near term future, officials from the Army, Navy and Air Force cyber commands joined the Federal Drive with Tom Temin and Amy Morris for a special Federal News Radio panel discussion.

What do you see as the top cyber challenge?

Air Force Brig. Gen. Ed Wilson Director of the Air Component Coordination Element Air Forces Cyber/24th Air Force	Col. Thomas Goss Chief of the Strategic Initiatives Group Army Cyber Command	Navy Capt. Jim Brokaw Director Operations and Readiness U.S. Fleet Cyber Command