Exhibit 99.1

Joint Filing Agreement

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including amendments thereto) with respect to the Common Stock, par value $0.10 per share, of Aerojet Rocketdyne Holdings, Inc. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated:   March 27, 2017	STEEL PARTNERS HOLDINGS L.P.
	By:	Steel Partners Holdings GP Inc. General Partner
	By:	/s/ Jack L. Howard
		Jack L. Howard, President
	SPH GROUP LLC
	By:	Steel Partners Holdings GP Inc. Managing Member
	By:	/s/ Jack L. Howard
		Jack L. Howard, President
	SPH GROUP HOLDINGS LLC
	By:	Steel Partners Holdings GP Inc. Manager
	By:	/s/ Jack L. Howard
		Jack L. Howard, President
	STEEL PARTNERS HOLDINGS GP INC.
	By:	/s/ Jack L. Howard
		Jack L. Howard, President
	STEEL PARTNERS LTD.
	By:	/s/ Jack L. Howard
		Jack L. Howard, President
	/s/ Jack L. Howard
	JACK L. HOWARD as Attorney-In-Fact for Warren G. Lichtenstein