There are currently at least 2 bands using the name Balaclava 1)
Balaclava is a hardcore band from Richmond, VA. Their "SHAME" EP is available on forcefield records.
In 2011 they released their first full length called "Crimes Of Faith" on Southern Lord.
2) Energic, positive sXe hardcore from Czech republic. In the beginning of 1997 the brothers Jakub (guitar) and Honza (drums) and the brothers Jan (vocals) and Ales (bass) started to play in a band called xBalaclavax.

Read more about Balaclava on Last.fm.