One of the most iconic Federal Signal siren duos, the 2T22 and 3T22! You most likely picture either this or the Thunderbolt when you think "air raid siren" or "cold war siren".
Timestamps:
0:00 | Intro
0:09 | Steady (Alert)
2:10 | Wail (Attack)
4:35 | Fast Wail (Fire)
6:39 | Alternate Steady / Hi-Lo (Fire)
8:40 | Author's note
8:51 | End of video