It means "Old Sergeant Major".

Smaj is a nickname, if you will, for Sergeant Major.

Use of it by the troops is sort of honorific and implies respectful affection.

I'm very proud of the fact that my troops would refer to me as the Old Smaj.

Even more so due to the fact that I attained the rank at the age of 36.

I was the youngest "old Smaj" around for a while.

I'm now retired.

Have been for 20 years.

In fact, I've been retired for as long as I was on active duty.

So I guess, now, I really am the old Sergeant Major.

I'm enjoying my inflation/recession/depression proof retirement, but I ain't enjoying the fact that obama is the POTUS.

Liberals can kiss my ass, RINOS can FOAD.

In fact, the republican party can kiss my ass.

I'm not a republican.

I'm a conservative.

There is a difference.