Kevin Bembridge who posted the most recent perspective is a former president of Phi Beta Sigma at Howard. So its gone PBS -> APO -> PBS.
And given their mention of Brother Young, I looked up which NPHC brother Young was a member of, you guessed it, Phi Beta Sigma.
http://www.pbsfcu.org/ (He is a board member Emeritus of the credit union) This is the only mention of him as a brother of PBS on the net.
Love to get numbers as to who has more on the yard, Zeta Phi Beta Sigma or Alpha Phi Omega.