What does HADR stand for?

Dire Dawa/Aba Tenna Dejazmatch Yilma - Ethiopia - ICAO location identifier (ICLI)

Halsey Drug Co., Inc. (SAUO)

Hughes Air Defence (or Defense) Radar (SAUS)

Hughes Air Defense RADAR - Military

Hadrian - of Scriptores Historiae Augustae - Classical studies (OCD)