http://www.cdc.gov/niosh/fire/pdfs/face200737.pdf - http://www.cdc.gov/niosh/fire/reports/face200737.html - NIOSH report - 10-60 or 10-66 got a bunch of additional units - taking off SCBA mask to use radio is bad
http://youtu.be/rNf0jkgwZ90 - You Tube videos