diff --git a/Data/Abbr/military.csv b/Data/Abbr/military.csv
index 397ccd76..4811e206 100644
--- a/Data/Abbr/military.csv
+++ b/Data/Abbr/military.csv
@@ -361,6 +361,7 @@ IRR,Individual Ready Reserve
 IRS,Inertial Reference System
 IRST,Infra-Red Search-and-Track
 ISOPREP,Isolated Personnel Report
+ISW,Institute for the Study of War
 IT,Information Technology
 JA,Judge Advocate
 JAAT,Joint Air Attack Team