Table:
|  | Fiscal 2018 | Fiscal 2017 | % Change |
| --- | --- | --- | --- |
|  |  | (in millions) |  |
| Sales | $  207.0 | $  168.9 | 23 % |
| Operating loss | (0.1) | (9.3) | (99) |
| Adjusted EBITDA | 26.2 | 14.4 | 82 |
Paragraphs:
Cubic Mission Solutions
Sales: CMS sales increased 23% to $207.0 million in fiscal 2018 compared to $168.9 million in 2017. The increase in sales was primarily due to increased orders and shipments of expeditionary satellite communications products, tactical networking products, and Command and Control, Intelligence, Surveillance and Reconnaissance (C2ISR) products and services. Businesses acquired during fiscal years 2018 and 2017 whose operations are included in our CMS operating segment had sales of $5.6 million and $1.5 million for fiscal years 2018 and 2017, respectively.
Amortization of Purchased Intangibles: Amortization of purchased intangibles included in the CMS results amounted to $20.8 million in 2018 and $23.6 million in 2017. The $2.8 million decrease in amortization expense is related to purchased intangible assets that are amortized based upon accelerated methods.
Operating Income: CMS had an operating loss of $0.1 million in 2018 compared to $9.3 million in 2017. CMS realized increased profits from expeditionary satellite communications products, tactical networking products, and C2ISR products and services. As mentioned above, amortization of purchased intangibles decreased to $20.8 million in 2018 compared to $23.6 million in 2017. CMS increased R&D expenditures between 2017 and 2018 by $10.8 million, primarily driven by development of new antenna technologies. Businesses acquired by CMS in fiscal years 2018 and 2017 incurred operating losses of $4.7 million in fiscal 2018 compared to $2.9 million in fiscal 2017. Included in the operating loss incurred by acquired businesses are acquisition transaction costs of $1.6 million and $1.8 million incurred in fiscal years 2018 and 2017, respectively.
Adjusted EBITDA: CMS Adjusted EBITDA increased 82% to $26.2 million in 2018 compared to $14.4 million in 2017.
The increase in CMS Adjusted EBITDA was primarily due to the same items described in the operating income section
above, excluding the changes in amortization expense and acquisition transaction costs discussed above as such items are
excluded from Adjusted EBITDA.
Question:
What is the decrease in amortization expense related to?
Answer: purchased intangible assets that are amortized based upon accelerated methods