decision decision decision

A prestigious rank for all NCC cadet to get, i am selected to go for this course which most likely is from 24 March to 12 April, which meant i would most likely miss three whole week of church, how how how? One side i do not want to miss church that much, another side this is hard to get in, much more it only come twice a year and did not go last year due to Mission Trip. So how? Go or not to go???