Below might indicate why they dropped Laser for ACP, it was...

Below might indicate why they dropped Laser for ACP, it was mainly for reasons of obligation.

Uhttps://fissilematerials.org/library/doe15b.pdf
U.S. nuclear nonproliferation policy and U.S. international agreements for peaceful uses
of nuclear materials require that any nuclear weapons material be produced using resources,
technologies, production equipment, and infrastructure that are free of peaceful use restrictions.These restrictions come from two sources: (1) foreign imposed peaceful use
obligations derived from foreign-origin uranium, processing equipment, or technologies, and (2)peaceful use encumbrances derived from U.S. Government policy. These restrictions affect all conversion, enrichment, fuel fabrication, and commercial power reactors being employed for defense purposes.Department of Energy I October 2015
The most pressing defense mission need is for tritium, which is produced by irradiating
tritium -producing burnable absorber rods (TPBARs) in a single commercial light
water reactor owned and operated by the Tennessee Valley Authority (TVA) . The Department expects to need to use two TVA reactors to produce tritium based on recent analyses. In keeping with the above principle, each LEU fuel core loaded into TVA reactors for tritium
production must consist entirely of LEU that is both free from foreign peaceful-use obligations and unencumbered by U.S. nuclear nonproliferation policy restrictions.