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Will the Namera replace the Puma in widespread service.
Eventually, yes.
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I thought the Namer HAPC was considered too expensive to replace the M113 and Achzarit APC?.
The "Namer" is a new generation heavy APC aimed to replace the former generation ("Achzarit", "Nagmachon", "Nakpadon"), however given the large number of variants of these heavy APC's, I'm sure they will serve side by side for many more years.
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Does it mean the Namer and the Eitan serve side-by-side with the IDF infantry and paratroopers.
Correct. The "Namer' will be the standard heavy APC, while the "Eitan" will be replacing the obsolete "Bardelas".