1400 Zulu Time
General build up to hostilities cease with messages from early warning sites and scientific monitoring stations alerting toward the arrival of objects over earth. All attempted communications toward these vessels go unanswered until later in the day.
1445 Zulu Time
Two deeply buried organizations in the Russian and American governments issue orders and directives to their active armed forces as well as messages to other armed forces, they simply read to disperse and cover with attached high level authorizations.
1900 Zulu Time
Admiral Vesin'lev, utilizing humanity's compromised global communications, issues a demand to all national powers and their military forces, instructing them to carry out a united and unconditional surrender. She ends the message with an ultimatum that bombardments and invasion will begin in three hours if this condition isn't met.
1920 Zulu Time
The message, arriving across most communications mediums, sends the global populations who are already stressed about impending global war into a panicked frenzy.
Spontaneous self-evacuations begin to occur from major population centers.
Societal breakdown is rapid as law enforcement, emergency services, and medical providers flee or drown under the deluge of calls from an imploding panicking society. Most however join the exodus.
1940 Zulu Time
US Military forces on most installations are ordered off base with any equipment that can be taken or rendered mobile, some will remain on site in bunkers or hardened facilities… these will not survive but will maintain command and control up to the moment of impact.
Aircraft disperse to secondary fields or 'field' bases setting up on major highways.
Infantry and Mechanized forces fleet into the countryside with any operational equipment.
Most military forces across the globe follow a similar deployment.
Units in the field in both Europe and in Asia follow nuclear warfare disperse and cover practices.
2000 Zulu Time
Most government officials have been rushed from population centers to covert sites, most are known to the aliens whom will either capture or kill a larger amount of their number. Some however will escape confinement.
2030 Zulu Time
Numerous attempts by various organizations are made to contact the alien fleet and beg for more time or for a halt on the current actions, all go unanswered.
2150 Zulu Time
The ZIRCON Satellites
A few minutes before the time expires space based illegal thermonuclear weapons are turned on the fleet when they go unnoticed, three 25 megaton enhanced radiation explosions occur over South America, Russia, and Europe. These damage a significant amount of the fleet and destroy a few nearby vessels. However a consequence of these detonations is widespread EMP damage to those region's power grids and electronic systems.