John a Marine

I am looking for a story where John is a Marine and his little brother Alex is working for SGC.  John thinks he is "just a Marine scientist" and doesn't realize that Alex goes through the gate.  There is a section where Alex argues with Carson who won't listen when Alex tries to tell him that one of the men has a microbomb in his leg, not a bullet.

I know I have read this several times but I have searched all over for it and can't find it.  I'm sure it is right in front of me though!  I hope someone can help me out on this.