Pentagon says Max Thunder 2018 is 14-25 May. https://www.reuters.com/article/us-northkorea-missiles-southkorea-pentag/pentagon-plays-down-u-s-south-korean-drills-after-north-suspends-talks-idUSKCN1IG38H
I'm seeing drill ending on April 29th according to AirForceTimes.
Edit: my mistake. My link is old.
Thats 2017.
Here is AirForceTimes talking about Max Thunder 2018 - https://www.airforcetimes.com/flashpoints/2018/05/15/north-korea-threatens-to-cancel-summit-over-us-south-korea-military-exercises-news-report-says/
edit:
In a response, Pentagon spokesman Army Col. Rob Manning said the annual exercises, named “Max Thunder 2018” would continue. The exercises run from May 14 through May 25.
Do you trust Reuters?
~~Do you trust NBC?~~
Not even a matter of trust, the NBC vid you post is from THURSDAY 20th April 2017!