Trial by Fire.
The Angels use a pristine white paint scheme with gold trim.
Per FM: Merc (revised), page 40
The command insignia is a portrayal of the Greek character Icarus flying too close to the sun. Per FM:Mercenaries Revised, page 40.
Grasshopper, FM: Mercenaries (plate 12)
Thunderbolt, FM: Mercenaries Revised (plate 7)
(text), FM: Mercenaries (page 34)