The best replacement for reserves is national guard.

The best alternatives to reserves are rated as following:
★★★★★  national guard
★★★★  active duty
★★★★  resources
★★★  guard
★★  active duty air force
★  rotc
★  active duty army
★  air national guard
★  retained earnings
★  national guard which is better
★  guard which is better
★  army national guard
★  air force reserves
★  resources oil
  deposits
  management reserves
  resources mining
  smaller reserves
  inventory reserves
  enlisted
  enlisting
  army reserves
  gross international reserves
  air guard
  provisions

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Speaking about reserves, one probably shouldn't forget about reserves.

Other search terms related to reserves and their ratings are:
★★★★★ reserves
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reserves
national guard
active duty