The easiest thing to miss in Escape isn't an enemy. It's the office just before you leave the large sleeping quarters. Once that room is clear, head towards the exit, then check the closed door on your right before moving on. Inside, a wall safe holds Gaz's dog tags, the collectible tied to Never Forgotten. If you've been browsing MW4 Bot Lobbies (https://www.u4gm.com/cod-mw4/bot-lobbies), keep this campaign objective separate from your multiplayer plans. Here, the important part is spotting one small doorway before you walk straight past it.
Get the number before the shooting starts
You'll need 8410 to open that safe, and the clue appears earlier than the safe itself. Near the start of Escape, follow the green corridors towards the administrative offices. Watch for a soldier behind a window ledge. After he pulls back, enter the small office and inspect the green desk beside the computer monitor. There's a document there with the updated security sequence. Read it rather than rushing through the room. Remembering those four digits now saves you from reaching the keypad without the answer.
What you need Where to look
Security document Green desk beside the monitor
Safe code 8410
Gaz's dog tags Wall safe near the sleeping quarters exit
Know what you're looking for
Never Forgotten is about recovering Gaz's tags, not simply discovering the office or reading its paperwork. That distinction matters. The document gives you access, but the item inside the safe is what completes the objective. Think of the route as two separate stops: collect the information early, then use it later. You don't need to search every desk in the compound. Keep those two locations in mind and let the mission carry you between them.
Clear the room before checking doors
The large sleeping area is your next landmark. Metal bunk beds and wooden lockers make it easy to recognise, but don't start hunting for the office while enemies are still pushing into the room. Deal with the firefight first. Ammunition can run low here, so make your shots count and be ready to use your sidearm. Trying to slip past everyone leaves you exposed while you're checking the corridor. Once the shooting stops, take a moment to get your bearings.
Check your remaining ammunition before moving.
Locate the main exit without leaving.
Open the closed door on the right.
Take the tags before moving on
Inside the smaller office, approach the wall safe and enter 8410 on its keypad. When the door opens, collect Gaz's dog tags from the shelf; opening the safe alone isn't the objective. Taking them unlocks Never Forgotten. Players also browsing cheap Bot Lobbies MW4 (https://www.u4gm.com/cod-mw4/bot-lobbies) should keep that separate from this collectible route. For this mission, it's the document, the right doorway, and the tags themselves that matter.