Don’t stress urself mate I also applied to join the Army and I passed the first two tests successfully, such as the physical test and the written test, I failed the interview, I barely said two words they still called me to give me an opportunity. but I couldn't make a sound and they close it, now I’m just in home for months applying for others jobs, in this case I don't know what would help but all I know is to tell you that you are not alone