Mohammad Monusul, an under training assistant commandant, was found hanging in his hostel room at Kadarpur camp here, some 12 km from Gurgaon city.
Monusul, who hailed from Belgaum, was on a year-long training which began in September.
The deceased left a suicide note saying no one was responsible for his death.
“All my friends are good, my training officers are also good, I am killing myself,” read the note, police officer Suresh Kumar told IANS.
Monusul, who was not married, also apologized to his family. “I don’t want to die, but I am dying. I know I may go to hell but I am going,” he wrote.
His body was handed over to his family members after autopsy.
Monusul’s colleagues told police that he appeared normal before killing himself.