Please forgive me (Ereri military au)

So hello again! I've been in army cadets for a long time now and I've had this idea in my head for a while so I'm finally going to complete it! The titles will all add up to make a sentence in the military alphabet first hint, indigo is I ~ MoonPawz
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3rd person PoV

"Captain please!" The brunette pleaded. He applied pressure to the ravens wound.
"I'm so sorry Eren." The man coughed up, blood following.
Tears ran down the cheeks of the teenagers, his eyes red and puffy as he held the captain in his arms.
"Please forgive me Eren." The Captain said his eyes closing weakly. "We'll meet again....I swear...." his final breath was taken as the body went limp.
"No!no!no! Captain wake up!" He said shaking his shoulders. "You can't leave me!" He said through gasps of despair. A thunder of hooves could be heard. Mikasa, armin,jean and hanji all saw the pair. Hanji broke into tears as she saw her final and closest friend dead. The death of the captain shook everyone, they a thought humanity was done for. That was 1,168 years ago.