Index of which Marvel characters appear in which issues:

A.I.M. Soldiers (#5)
Ares (#7)
Beast (#3, #7)
Black Cat (#2)
Black Widow (#5, #7)
Boomerang (#3)
Captain America [Steve Rogers] (#1 - #5)
Captain America [James Buchannan Barnes] (#7)
Colossus (#3, #7)
Cyclops (#3, #5, #7)
Danny Matthews (#5 - #6)
Daredevil (#2, #7)
Deadpool (#7)
Doctor Strange (#7)
Edwin Jarvis (#3)
The Falcon (#7)
Ghost Rider (#4)
Gorilla-Man (#7)
Hawkeye [Kate Bishop] (#7-cover)
Hercules (#7)
The Hulk (#2, #6 - #7)
Hulkling (#7)
The Human Torch (#1 - #2, #6 - #7)
HYDRA Soldiers (#4)
The Invisible Woman (#1 - #2, #7)
Iron Fist (#7)
Iron Man (#1 - #3, #5 - #7)
Kang the Conqueror (#3)
Kingpin (#2)
Kree Soldiers (#1)
Luke Cage (#1 - #3, #7)
Mister Fantastic (#1 - #2, #7)
Ms. Marvel (#7)
Nick Fury (#2 - #4, #7)
Nightcrawler (#7)
Patriot (#7)
Private First Class Matthews (#5)
The Punisher (#4)
The Sentry (#1 - #2, #7)
Shadowcat (#3)
She-Hulk (#7)
The Silver Surfer (#4)
Spider-Man (#1, #3, #6 - #7)
Spider-Woman (#1, #3)
Stark Personal Armor System (#6-#7)
Storm (#7)
The Thing (#1 - #2, #7)
Thor (#2, #7)
Vision (#7)
White Queen (#3, #7)
Wolverine (#1- #3, #5, #7)
Wonder Man (#5)

Real Life Military Personnel Appearances:

COL Max Baker (#6) (on video monitor)
TSgt Theresa Bradley (#7) (in Stark Personal Armor System)
SFC (Ret) James Wells (#7) (in Stark Personal Armor System)