Tucked in, at least in my opinion. I like a sharp look and I think loose tails would get caught on things. Also the more I thought about it the sleeve pocket would have to go. It is a shirt, if you wore a jacket over it the pens would get caught on the jacket and be unaccessible. I think the slanted packets would looks sharp and definitely distinguish us from FD, PD, Security, and the Mailmen out there. Also hardly anyone in the states wears green, seems like everyone is stuck in black or blue nowadays. I like green, kind of like Patton's Tank uniform he designed if anyone remembers that. Minus the gold football helmet.
Also we could drop the cheesy patches and go with white stripes on the epaulets, ala our neighbors to the North.