If you are military - you need spares on the shelf and not rely on ordering some via complicated ways (to many who needs to sign the approval)
No wonder they're down most of the time.
Still, it seems, they haven't learned from the past.
When we went to sea for BOST with two SeaLynx on a frigate - we had three sets of sealing parts for the generator, which are needed with each generator change/swap.
Engine swap/finding problems by interchanging ie generators - you can imagine, how fast you can ground the helicopter?
So we flew to Portland, with some things to swap for parts........ - which helped to run the system - but not to show the problems of the system...