Sorry, but it's been a long time since scanners could be modified to extend or change their frequency coverage. The AIR band in your BC350C allows you to monitor commercial, private, and some military aircraft. If you want full military air coverage though, I suggest that you look at the reasonably-priced BC370CRS.
Bill B.
Listening in since the 60's
Buy a Regency MX7000, it has all the channels.
Hope this helps.
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