Fistly, military training is a subject that every fresher in every university in China must go through. And personally I think it's more benefitial than harmful. The opinions below are not necessarily my own opinions.
As an AU, the timeline roughly lies before kerozero episodes, when Keroro platoon hasn't formed yet. But most events are directly from my own military training experience. So timeline means little.
I wrote it as a practice, and it also helps me to go through writer's block when writing Old Stories. And I've never checked it before posting. So, warning of grammar mistakes...
It was a really fine day. Students got up early to start the military training for today. After doing morning exercises, they went to the mess hall for breakfast. It was all like a normal day in military training.
Keroro complained aloud as he walked back to the dormitory with his roommates. "It's too tiring! How can they make us train for as many as 14 days without a single day off?! I will surely go on strike soon. Is there anyone who agree with me?" He asked hopefully.
"Me!" Tamama yelled, gaining some irritated glares from the student pickets. "I've long been put up with all those craps they called training. My worst day when learning tae kwon do is on no par with this." But he didn't take his unusual talent in various fighting styles into consideration when making this statement.
Giroro just snorted in disdain. "You two are pathetic idiots who know nothing about honor or discipline. Military training is the best way to tough you weaklings up!"
Tamama gave him a glimpse, then grinned sardonically. "And you are not any more superior than us. Guess you were merely angry at the fact that you didn't pass the physical examination test to become a national defense student..."
Giroro's face reddened. Yes, he was an enthusiastic fan of military since his childhood. And he had swore that he would attend military academy after high school, or at least become a national defense student in this university. However, the fate seemed to like making fun of him a little too much: He who determined to be a soldier in the future failed the test for some hereditary disease which he hadn't ever heard of, while his classmate, the most peace-loving one in his class, passed all the tests with flying colors, not to mention his more than enough grades in the Collage Entrance Exams. Giroro would be openly lying if he said he didn't envy that classmate. But still, Zeroro was one of his best friends in high school, along with Keroro. He could do nothing but to mourn for his nonexistent luck.
Now they'd arrived at their dormitory, and decided to have some rest before gathering for training. And as they'd expected, they saw the fourth member in this room leaning on his private armchair, typing on the keyboard rapidly, and swallowed another full spoon of curry. Hearing they coming, he didn't even bother to turn his head, but gave out a "ku" sound as a greet. They didn't show any surprise, because they had been used to this scene days ago.
Kururu was in any way a genius. With his extremely high IQ, some would bet that he could make into the top university with his eyes closed in the CEE. But this unpredictable nerd couldn't care any less about which university he attend. When a full list of privileges he asked for was rejected by That university, he just chose this one in which he could mostly go his way. And one of the privileges was his reliever from military training.
But for others, there was still a long day to pass.