Hi ,I am Carl and I am new to posting here . The only 'secure' ,or discrete HAM radio I know of are several by ICOM that have the DSTAR option installed.
You use DIGITIZED audio and only other DSTAR gear or the computer dongles can HEAR what is going on. You can send voice or text (with a keyboard)
and it is discrete. I wonder though why someone wanting to be discrete would also want to transmit a signal on so many bands and not to mentions APRS ,
that ID's you ,and where you are every couple of minutes?
No HAM gear is accepted on FRS,GMRS,or MURS , though many will marginally cover those frequencies,the performance ,and antennas , would make it hardly
worth your while. There are some type accepted radios that can also work on HAM bands ,and this option may be better.
Personally,I feel a TEAM would be better served with 'single channel' radios ,more work,less fiddleing with radios, less confusion.The command post is where
the multi-service radio would best serve to monitor for distress calls and then direct help.