Minpei Shikan Kunren Butai

(Japanese: 民兵士官訓練部隊)

The full Japanese name of the ROTC-derived junior-high and high school militia training program, the Militia Officer Training Unit, which funnels officer candidates into the JIDF.

The name of the program is usually contracted into a katakana non-word, mishikubu (ミシクブ). 

The Minpei Shikan Kunren Butai is a high-school (and later extended to junior high school) program first instituted in Sasanami based loosely on the US ROTC program. There are a couple of unfortunate translations of the contracted "word" mishikubu which is the usual way of referring to it – one of which is something like "nine minutes to see" (見し九分, "Mishi kubu"), which the bullies would throw in the mishikubu "boys'" faces as an insult, i.e., "that's how long you'll last in a real fight."  That the mishikubu would then invariably proceed to beat the hell out of the bullies, which often convinced the bullies of the error of their ways and had them beating feet to the school office to sign up for the program themselves, did not soften the insult in any way, shape, or form. Also compare/contrast "ninety-day wonder", which was the (American) derisive term for officers who came out of accelerated-training courses during World War II, allegedly ready to lead men into combat.

Mishikubu boys who graduate from the program are accepted preferentially to the JIDF's officer candidate school, but are expected to attend and pass the JIDF's Basic Training (Japanese: 基本訓練, romaji: kihon kunren) before being allowed to matriculate to OCS. This helps avoid wasting the time of training up an otherwise academically-sound officer candidate who is completely unable to deal with military life.

First mentioned in The Cross-Time Kamaitachi, pp. 278-280.

(For what it's worth, the author made this whole thing up; so far as he knows, there is nothing like ROTC in Japan.  But this isn't our Japan, after all.)