Final answer:
O-level activities are authorized to requisition or stock ALSS assemblies or parts to outfit 100% of assigned aircraft and aircrew.
Step-by-step explanation:
The question is asking about the percentage of assigned aircraft and aircrew that can be outfitted with ALSS assemblies or parts by O-level activities. ALSS stands for Aviation Life Support Systems. O-level activities are authorized to requisition or stock ALSS assemblies or parts to outfit 100% of assigned aircraft and aircrew.