32 cards where the set is “bro” and the card types include “soldier”

Aeronaut Cavalry (The Brothers' War #1)
Air Marshal (The Brothers' War #43)
Ambush Paratrooper (The Brothers' War #3)
Battlefield Butcher (The Brothers' War #86)
Citanul Stalwart (The Brothers' War #175)
Conscripted Infantry (The Brothers' War #129)
Fallaji Chaindancer (The Brothers' War #134)
Fallaji Vanguard (The Brothers' War #210)
Gaea's Courser (The Brothers' War #181)
Hajar, Loyal Bodyguard (The Brothers' War #211)
Harbin, Vanguard Aviator (The Brothers' War #212)
Hero of the Dunes (The Brothers' War #213)
Kill-Zone Acrobat (The Brothers' War #106)
Myrel, Shield of Argive (The Brothers' War #18)
Perimeter Patrol (The Brothers' War #188)
Phalanx Vanguard (The Brothers' War #19)
Recruitment Officer (The Brothers' War #23)
Rescue Retriever (The Brothers' War #288)
Retrieval Agent (The Brothers' War #60)
Roc Hunter (The Brothers' War #150)
Scrapwork Cohort (The Brothers' War #37)
Siege Veteran (The Brothers' War #25)
Skystrike Officer (The Brothers' War #62)
Spectrum Sentinel (The Brothers' War #244)
Survivor of Korlis (The Brothers' War #28)
Tomakul Honor Guard (The Brothers' War #195)
Warlord's Elite (The Brothers' War #32)
Wing Commando (The Brothers' War #73)
Yotian Frontliner (The Brothers' War #42)
Yotian Medic (The Brothers' War #33)
Yotian Tactician (The Brothers' War #228)
Zephyr Sentinel (The Brothers' War #74)

The message was clear to Sorin—time to search for something else.