Do you mean the Brownwood MOA? Camp Bowie is a National Guard training area. I don't think they have aircraft there.
Check the Fort Worth Center freqs at Brownwood, Dublin and Abilene
Fort Worth (ZFW) Air Route Traffic Control Center (ARTCC) Scanner Frequencies and Radio Frequency Reference
Some of these units use their own freqs in that area
Fort Worth NAS JRB Scanner Frequencies and Radio Frequency Reference
Sheppard Air Force Base Scanner Frequencies and Radio Frequency Reference
You will probably have to search the military air and ground bands and find them yourself.
For aircraft search
138 - 144 AM 25 kHz steps
148-150.75 AM 25 kHz steps
225-400 AM 25 kHz steps
for ground search
30-88 FM 25 kHz steps
138-144 NFM 12.5 kHz steps
148-150.75 NFM 12.5 kHz steps