Sandy Hook is such as scam. The actual exercise for the operation took place the day prior on Dec 13 2012 at St Rose of Lima (with the staging area safely down the street at Sandy Hook Elementary and the Sandy Hook Firehouse). What we saw on Dec 14 (phase 2 AKA the real-time evaluation phase) was simply them releasing the day priors exercise elements as if it were a real event happening live (using aspects of the previous days drill as the framework to build off of + the staging area which was left overnight and remained at the school during the evaluation roll-out to help transition the script to a different location the following day (Sandy Hook Elementary)).

Dr Carvers Magnificent Thing (Sandy Hook, late afternoon on Dec 13, 2012)

Ryan Lanza is detained by authorities in Hoboken on Dec. 13, 2012, the day his brother Adam Lanza, 20, is believed to have committed the second worst school shooting in U.S. history in Newtown, Conn. (credit: CBS 2)
http://newyork.cbslocal.com/2012/12/14/police-respond-to-report-of-school-shooting-in-conn/

Dec 13, 2013 2:26 PM : "Reid Remarks On The Anniversary Of The Newtown School Shooting"
https://democrats.senate.gov/2013/12/13/reid-remarks-on-the-anniversary-of-the-newtown-school-shooting/#.Vjpu_ytcJZg

Dec 13 2013: Feinstein Statement on Anniversary of Sandy Hook Shooting
https://www.feinstein.senate.gov/public/index.cfm/press-releases?ID=57085aaa-232c-419f-a162-83b241351ed7

Dec 13, 2013: Pelosi Statement on One-Year Anniversary of the Shooting in Newtown
https://pelosi.house.gov/news/press-releases/pelosi-statement-on-one-year-anniversary-of-the-shooting-in-newtown

Taken From Official FBI Website: "Sandy Hook Elementary School shootings, Newtown, Connecticut, 12/13/12 Sandy Hook Elementary School Shootings Reports, Connecticut State Police"

...and on and on...

Anyways for anyone who cares Sandy Hook was advanced DHS HSEEP training done using a recently retired exercise series called FEMA TOPOFF (annual exercise of the FEMA NLE program). In 2009 the FEMA NLE program (National Level Exercise) was retired and in 2012 transitioned to become the FEMA NEP program (National Exercise Program) and with this the old TOPOFF annual exercise was replaced with FEMA CAPSTONE as its annual exercise series. Sandy Hook was run unofficially using the confusion of the program transition and its switch from TOPOFF to CAPSTONE that year (they used the TOPOFF 2010 script which never ran due to the program being canceled prior to its activation, and used the switch-over to FEMA CAPSTONE 2012 as the official cover).