Daily Ops

Daily Ops are a gameplay feature in Fallout 76, introduced in the One Wasteland For All update. Using the game's instancing technology, Daily Ops aim to provide challenging, randomized, and repeatable dungeon-clearing missions for experienced players. Daily Ops normally rotate every day at 12:00pm EST, but currently rotate at 1:00pm EST.

Details
Daily Ops take place in an instanced dungeon, randomized each day. They can be completed solo or with teammates in groups of up to four. If the mission is successfully completed, the participants will be rewarded according to their completion time. The operation is repeatable, though certain rewards may only be available once per day.

The objectives, locations, enemies and their mutations are randomized each day. Enemy mutations are powerful effects, exclusive to hostiles in Daily Ops, which have a significant impact on gameplay. Some mutations cause enemies to always detect sneaking players, while others grant healing abilities.

Rewards
Daily Ops will provide greater rewards if they are quickly completed, detailed in the after-action report. There are three tiers for each level of rewards: Initiate (16 minutes or less), Paladin (12 minutes or less) and Elder (8 minutes or less). Each tier offers its own pool of rewards. Completing which Elder time in the first Op of the day will reward all 3 pools - Initiate, Paladin, and Elder. The rare Daily Ops item rewards may only be obtained once each per day. 
 * Received only if plan not already learned.

Note that attaining a higher tier will reward items from lists of all previous tiers provided those tiers weren't already earned. For example, earning "Elder" rank will reward Elder, Paladin, and Initiate rewards, if those tiers haven't already been earned.

Changelog

 * Prior to patch 1.5.1.26, the Elder reward tier only had an 80% chance to grant a Daily Op item as opposed to being a guaranteed drop.
 * Vaults 94 and 96 were originally part of the vault raids, introduced with Nuclear Winter, though vault raids were scrapped in favor of the broader Daily Ops feature.

Behind the scenes
Steve Massey, a lead level designer on Fallout 76, led the development of Daily Ops alongside lead UX designer Don Etgeton.

Bugs

 * The minigun shredder will not always count as a melee attack against Resilient enemies. If the enemy is being hit before their HP reaches 1, they will be killed as expected. If they are not hit by the shredder until after they reach 1 HP and begin glowing, they will not be killed by the shredder.
 * The Pain Train perk does not count as a melee attack against Resilient enemies.
 * Thrown melee weapons, such as the Sheepsquatch shard, do not count as a melee attacks against Resilient enemies.
 * Enemies with Active Camouflage may occasionally attack while stealthed, or may decloak while reloading or not attacking.
 * Enemies may occasionally spawn out of bounds in the Burrows and Vault 94.
 * Once a Daily Op is completed, the countdown timer to leave the instance may sometimes not appear.
 * The Muzak that normally plays in Valley Galleria is disabled during Daily Ops.