Hello Udisha, At the time of admission bond is made. Depending on that bond you have to serve in armed force. Bond is either for 7 years at for 20 years.  If you signed a 7 years bond , then you have to serve only armed forces for 7 years.  Later you can leave Armed Forces.  But of bond is for 20 years them you ja e to serve for 20 years.  Of you want to break bond then you have to pay Some amount which is decided In bond.  

I hope it will help you. 

Thanks.