Best list I can come up with for military Sentais:

Gorenger (It's a "secret espionage organization" so I'm counting it)
J.A.K.Q.
Battle Fever J
Sun Vulcan
Changeman
Jetman
Ohranger
GoGoV
Timeranger
Dekaranger (it acts more like a military than most of these, so I'm counting it)
GoBusters



Here's a few good ideas for battles:
Dekaranger Robo vs Signalman's mecha. You know, police bots.
FiveRobo vs Galaxy Mega. Teachers vs Stundents.

thanks for the list i got the 3 i am going to use also i am mainly focusing on the fist and main robos no secondary yet. so all secondary robo or forms are not include in this tournament but thank you for the ideas. i leave this poll open until tommrow and i post round 5 then. so you still got time to vote.

There's the obvious one of Kakure Daishogun vs. Senpuujin (I chose Kakure over Muteki because Kakure fits the ninja theme and design better).

and the fact that shogun megazord was used as there first main megazord is awesome but seepujin due to the martial arts theme before hand

GoGoV vs Dekaranger. EMT vs police.