Your base does not have enough inventory to keep the same amount
of the equipment the team had previously onboard the craft before
the mission. For example, you had 16 grenades on the Skyranger.
You used up 4 on the mission, but the base only has 3 left, so
base cannot reprovision you to the original stock of 16.
SOLUTION: Stock up a bit more at the base.

7.3.2 I bought HWP's but I can't use them!
Did you get them a full load of ammo? You cannot put HWP's
onboard crafts unless you have enough ammo for each
(automatically loaded). HWPs except Laser Tanks and Plasma
Hovertanks require ammo. Cannon Tank needs 30 shells, Rocket
Tank needs 8 rockets, and Fusion Hovertank needs 8 HWP Fusion
Balls. Always keep twice or more in stock, especially HWP Fusion
Balls (which must be built).

7.3.3 I keep running out of missiles for crafts!
[KSC / FAQ] If you ran out of money also, use weapons that
doesn't use ammo, like plasma beam and laser cannons. On the
other hand, Avalanche is cheap at 9000 each and has a good punch,
so stock up on those, keep 4 times capacity around. For example,
Avalanche launchers holds 3 each, so Avalanche stock should be 12
per Avalanche launcher. If it doesn't fit, add a General Stores.

7.4 When to sack / retire things
[KSC] Crafts that were too heavily damaged (i.e. over 50%) should
be sacked and a new one hired, unless it must be manufactured and
you are short on money, time, or materials. Repair time may be
too long. That's one more reason to keep your engineers busy...

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