I can ID a few of the backup stories, ones written by main feature writers Bernstein or Hank Chapman. The one art ID I'll put forth is a story by the "Dinosaur Island" Batman artist, Paul Cooper.
Jumping on the war magazine bandwagon for a while, Clark Mason is in uniform as an Army lieutenant and then a captain, in combat in Korea in #9 through #13.
Clark Mason writers in Spy Fighters
|Mar/51–Jul/52||1-9||(all Clark Mason stories)||Robert Bernstein|
|The Vision||Hank Chapman|
|Nov/||11||(all Clark Mason stories)||Bernstein|
|Jan/53||12||The Silent Death||Bernstein|
|The Strange Enemy||Chapman|
|Mar/–Jul/53||13-15||(all Clark Mason stories)||Bernstein|
Backup stories in Spy Fighters
|Sep/51||4||Deadliest of the Species||pencils: Paul Cooper|
|Nov/||5||Arsenal for R-Day||wr: Bernstein|
|Mar/52||7||The Tower of Terror||wr: Bernstein|
|Sep/||10||Secret Weapon||wr: Bernstein|
|Nov/||11||The Destroyer||wr: Bernstein|
|Jan/53||12||The Human Target||wr: Chapman|