As someone that has worked in corporate and executive search/recruiting for multiple industries, i would say my general rule of thumb would be:
If within 5 to 7 years of graduating, or you know that the hiring manager is an Ag/fomer CT or BQ, AND you were in a leadership role, then absolutely put it. Looks great. If you werent in said leadership role, i would advise putting your Corps experience ONLY on your first resume after school, after that, leave it off.
If 5-7 years after graduating, or you did not have the leadership role, or you are unsure if the hiring manager is an Ag, then leave it off. No unbiased hiring manager is going to care what extracurricular activity you were apart off, regardless of what it was. C.O. of an outfit/President of your Fraternity/Vice President of ABC society or club, it makes no difference. If you are still trying to get a leg up on a job interview 5+ years AFTER college by using things you did in college, then perhaps you should get better experience or write a better resume.
as i write that, it comes across very dick-ish. but after looking at resumes for the better part of the last 10 years, i would say that one of my biggest pet peeves, was seeing a 15 year professional, still putting college leadership experience on his resume. Even as an Ag, it would have no bearing on your candidacy.