text: from django.contrib import admin
  from .models import Unit, CrewRoll, CrewMember
  
  class UnitAdmin(admin.ModelAdmin):
      ''' Customize Unit Admin '''
      list_display = ("identifier", "unit_type", "is_active", "is_assigned", "is_alliance", "location", "operator", "phone")
      list_filter = ("unit_type", "is_active", "is_assigned", "is_alliance", )
      search_fields = ('identifier', 'location', 'phone', )
  
  admin.site.register(Unit, UnitAdmin)
  admin.site.register(CrewRoll)
  admin.site.register(CrewMember)
  