I'd say they are not common. Most of the time, navy basic training is a structured and positive experience. The instructors are trained to handle trainees properly. But of course, every now and then, you might hear a horror story. Maybe it's because someone had a different perception of the normal training intensity. For example, what one trainee might find as 'horror' like the early morning drills, another might see as just part of the routine.
In general, they are not common. The navy invests a lot in training facilities and personnel training to make sure the basic training goes smoothly. But, due to the large number of trainees, there could be some individual cases that seem like horror stories. For instance, a trainee might be more sensitive to the strict discipline and feel it's a horror, while for others it's just normal military discipline. So it depends on different perspectives as well.
Chapter 348, "Scheming and Being Schemed Against, East Ridge Five, Zhu Yang's Threat, The Dust Settles (Part 2)", is the clearest early answer because it turns Zhao Yuanshan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Lu Yang of East Ridge, ready for your instruction!" As number three's... and follows through with Second Uncle, catch this!" Zhao Yuanshan no longer concealed....
Chapter 283, "You Will Never Understand the Importance of Family!", is the clearest early answer because it turns Primordial Forest's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Shen Lan furrowed her brows as Jiang Shixu suddenly appeared before...
Chapter 170, "This Family Will Fall Apart Without Jiang Li", is the clearest early answer because it turns Jiang Li Watching's situation into a concrete plot event. Early on, Watching the two who had long remained silent, the PD shifted his....
Chapter 329, "Refining the Jade Dew Stone, Eve of the Cold Element Festival", is the clearest early answer because it turns Li Xuanling's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Xia City, Political Hall Upon returning, Xia Hong immediately... and follows through with Let her first break through, twenty-seven manes, mid-stage Cold....
Chapter 246, "Betting He Can't Last Even One Second", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. The chapter gives readers a real answer by opening on At that moment, not only Su Yinwan but also Shang Shaojing's...
Chapter 100, "Ominous, there might be a bloody disaster!", is the clearest early answer because it turns Animal World's situation into a concrete plot event. The chapter gives readers a real answer by opening on The barrage was about to die of laughter.
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Chapter 37, "Major Changes in Xia City, the Wealthiest Person in Great Xia (Part 2)", is the clearest early answer because it pushes Hong Yu into a new phase or setting. It opens with Excluding the overlapping positions, the total is 153. and closes on Recent changes in Xia City are more than just this city wall." He....