Metal Gear Solid V: The Phantom Pain has many collectibles including 10 memento photos. These mementos are earned by extracting a soldier and finishing a specific Mother base Soldier Side Ops. Each soldier is equipped with tactical items to make them more difficult to capture than other soldiers. Once earned, you can visit Paz in Mother Base to view a cutscene corresponding to the memento.
How to Unlock: Mission 06
Memento Photo #1: Side Ops 51
Ops Location: Southeast Afghanistan
Soldier Location: On a hill northeast of the Eastern Communication Post.
Memento Photo #2: Side Ops 52
How to Unlock: Mission 08 and Side Ops 51
Ops Location: Southwest Afghanistan
Soldier Location: Southwest of Da Shago Kallai.
Memento Photo #3: Side Ops 53
How to Unlock: Mission 16 and Side Ops 52
Ops Location: Northwest Africa
Soldier Location: East of Bwala ya Masa.
Memento Photo #4: Side Ops 54
How to Unlock: Mission 20 and Side Ops 53
Ops Location: Southwest Africa
Soldier Location: West of Nova Braga Airport.
Memento Photo #5: Side Ops 55
How to Unlock: Mission 23 and Side Op 54
Ops Location: Northeast Africa
Soldier Location: Near Kungenga Mine.
Memento Photo #6: Side Ops 56
How to Unlock: Mission 31 and Side Op 55
Ops Location: Southeast Africa
Soldier Location: East of Munoko ya Nioka Station.
Memento Photo #7: Side Ops 57
How to Unlock: Mission 31 and Side Op 56
Ops Location: West Afghanistan
Soldier Location: South of Yakho Oboo Outpost.
Memento Photo #8: Side Ops 58
How to Unlock: Mission 35 and Side Op 57
Ops Location: East Africa
Soldier Location: South of Lufwa Valley.
Memento Photo #9: Side Ops 59
How to Unlock: Mission 38 and Side Op 58
Ops Location: East Afghanistan
Soldier Location: East of Qarya Sakhra Ee.
Memento Photo #10: Side Ops 60
How to Unlock: Mission 38 and Side Op 59
Ops Location: Northwest Afghanistan
Soldier Location: Insidethe Aabe Shifap Ruins.