hmmm? the math doesn't add up.
3 years have passed since his death, and reincarnated in the world. working for the country knight for 2 years... uhhh? at 1 years old baby he join the army somehow...? what the fuck?
or is it just that after 3 years of his death, he reincarnated as a baby. grow up while doing some training and at around 8 or something he joined the army for 2 years or so?