If you are looking to add some serious difficulty to your team's routine, consider adding a few gun tosses. This move involves members of your team trading guns by throwing them to one another at certain points in the routine. These tosses can be simple or complicated, depending on the expertise of your ROTC team. It is worth noting that gun tosses are a gamble in competition -- if the toss goes well it could put you over the top, but a dropped gun could spell disaster for your team.
Drill downs are common competition events, but can also strengthen your team's performance if done on a regular basis. A drill down functions a lot like the children's game "Simon Says." Line your ROTC team up and begin giving them commands. Once they are comfortable, start giving them commands that sound correct, but aren't. For instance, instead of saying "Right, Face," you say "Right, Arms." Team members who do not listen carefully will complete the incorrect command and are out.
There is a big difference between getting it right on the practice field and getting it right with hundreds of spectators and a few judges. You can prep your team for some of this stress by forcing them to run their drill routine in public areas. Consider taking a field trip to a local park or college quad and staging an impromptu performance. Your team will learn how to stay focused in a crowd and you may build interest in ROTC programs as you go.