| 1903: | 3rd Australian Light Horse Regiment (Australian Horse) |
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| 1912: | 11th (Australian Horse) Light Horse Regiment │ |
28st (Illawarra) Light Horse Regiment │ |
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| 1918: | 7th Light Horse (Australian Horse) │ |
21st Light Horse (Riverina Light Horse) │ |
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| 1929: | │ │ │ │ |
linked into 1st/21st Light Horse (New South Wales Lancers) │ |
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| 1935: | │ │ │ |
unlinked 21st Light Horse and |
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| linked into 7th/21st Light Horse │ |
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| 1937: | unlinked 7th Light Horse (Australian Horse) │ |
unlinked 21st Light Horse (Riverina Light Horse) │ |
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| 1942: | 7th Motor Regiment (Australian Horse) │ |
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| 1943: | disbanded |
disbanded |
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| 1948: | 7th/21st Reconnaissance Regiment (Australian Horse) │ |
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| 1949: | 7th/21st Australian Horse | ||||
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| 1956: | disbanded |
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