According to new guidance, everyone without orders to wear a different SSI-FWTS will have to remove it, or change their SSI-FWTS?

The Regulation doesn't specify a "grandfathering in process for SSI-FWTS, nor does it specify if the new guidance applies to SM pre 31 March 2014. In this effect, according to the guidance, everyone without orders to wear a different SSI-FWTS will subsequently have to remove it, or change the SSI-FWTS with an authorized SSI-FWTS

21–17. Shoulder sleeve insignia–former wartime service
a. General. Authorization to wear a SSI indicating FWTS applies only to Soldiers who are/were assigned to U.S.
Army units that meet all the following criteria:
(1) The Secretary of the Army or higher must declare the theater or area of operation as a hostile environment to
which the unit is assigned or Congress must pass a Declaration of War.
(2) The units must have actively participated in or supported ground combat operations against hostile forces in
which they were exposed to the threat of enemy action or fire, either directly or indirectly.
(3) The military operation normally must have lasted for a period of 30 days or longer. An exception may be made
when U.S. Army forces are engaged with a hostile force for a shorter period of time, when they meet all other criteria,
and a recommendation from the general or flag officer in command is forwarded to the Chief of Staff, Army.
(4) The Chief of Staff, Army must approve the authorization for wearing the SSI for FWTS. Note: Units are not
authorized to make modifications to their SSI, or SSI-FWTS without prior approval from the DCS, G-1. A mirror
image SSI-FWTS is considered a modification.
(5) Personnel who served in a designated area as a civilian or a member of another Service, but were not a member
of the U.S. Army during one of the specified periods are not authorized to wear the SSI-FWTS.
(6) Unless otherwise approved by this regulation, Soldiers attached or under operational control (OPCON) to other
services are not authorized to wear their patches as their SSI-FWTS without written approval from DCS, G-1 or a
designated representative.
AR 670–1 • 31 March 2014 33
(7) Soldiers of all Army components (Active, ARNG, and USAR) who deploy during periods of service designated
for wear of the SSI-FWTS are authorized to wear a SSI-FWTS. There are no time-in-theater requirements for
authorization to wear the SSI-FWTS. Soldiers may not earn more than one SSI-FWTS during the same deployment.
(a) A deployed unit (company or higher) will wear its unit SSI as the SSI-FWTS, regardless of the headquarters
element deploying and the unit alignment or OPCON during the period of deployment.
(b) A deployed unit will not wear its assigned SSI as its SSI-FWTS when the SSI belongs to a major command,
such as an ACOM/ASCC/DRU or State Area Command, or a non-deployable unit. In such cases, the unit will wear the
SSI of the lowest echelon Army unit (company or higher) in the deployed chain of command as the SSI-FWTS. When
there is no intermediate unit (company or higher) in the deployed chain of command, these deployed Soldiers will wear
the SSI of the senior command in the theater as its SSI-FWTS.
(c) When echelons below company level (such as teams or squads) deploy, members of these units will wear the
SSI of the lowest echelon deployed Army unit (company or higher) in the deployed chain of command (based on
written orders) as the SSI-FWTS. When there is no intermediate unit (company or higher) in the deployed chain of
command, these deployed Soldiers will wear the SSI of the senior command in the theater as its SSI-FWTS.
(d) Individual Soldiers who are attached (to include OPCON, cross-leveled, assigned, or augmenting deployed units)
will wear the same SSI-FWTS worn by members of the deployed Army unit (company or higher) to which attached by
written orders. A Soldier who is further attached (to one or more units) during one deployment will only wear the SSIFWTS
for the first Army unit (company or higher) to which attached by written orders. Soldiers who deploy with their
unit (company level or higher) will wear the SSI-FWTS as outlined in paragraph 21–17a(7)(a), regardless how many
times they are further attached to other units as individuals or teams. Members of trial defense and Criminal
Investigation Division Command will wear the SSI of their respective commands as their SSI-FWTS.