For anyone else curious, Andrew Johnson's letters are (I think):

OSCE https://en.wikipedia.org/wiki/Organization_for_Security_and_...

OSCP http://en.wikipedia.org/wiki/Offensive_Security_Certified_Pr...

GWAPT http://www.giac.org/certification/web-application-penetratio...

GPEN http://www.giac.org/certification/penetration-tester-gpen

GCIA http://www.giac.org/certification/certified-intrusion-analys...

GCIH http://www.giac.org/certification/certified-incident-handler...

GSEC http://www.giac.org/certification/security-essentials-gsec

CISSP http://en.wikipedia.org/wiki/Certified_Information_Systems_S...

CEH http://en.wikipedia.org/wiki/Certified_Ethical_Hacker

eCPPT http://en.wikipedia.org/wiki/ELearnSecurity_Certified_Profes...

OSWP http://www.offensive-security.com/information-security-certi...

CCNA:S http://en.wikipedia.org/wiki/CCNA_Security#Cisco_Certified_N...

MCSE:S Microsoft Ceritified Systems Engineer: Security, discontinued