By Lisa Beilfuss 

Defense contractor L-3 Communications Holdings Inc.'s first-quarter earnings dropped 38% as sales declined in each of its four segments.

For the full year, the company expects sales of $11.45 billion to $11.65 billion, down from its earlier estimate of $11.75 billion to $11.95 billion. Excluding the impact of a planned divestiture of its Marine Systems business, L-3 continues to project profit of $7.35 to $7.65 a share this year.

Larger rivals Lockheed Martin and Northrop Grumman have similarly reported drops in first-quarter profit, but those companies lifted full-year earnings expectations.

The New York-based company supplies communications, intelligence and surveillance systems and products for customers including the Department of Defense, Department of Homeland Security and various government intelligence agencies. General sales to the government slid 10% from the year before, to $1.9 billion, driven by the U.S. military drawdown in Afghanistan and U.S. Government budget reductions.

Sales to international and commercial customers fell 4% to $814 million, driven by a decline in its Marine Systems segment on account of the weaker euro against the dollar. The company expects to complete the MSI divestiture in May.

"Our results for the quarter were below our expectations and were negatively impacted by additional cost growth on international head-of-state aircraft modification contracts in the Platform Systems business of our Aerospace Systems segment," said Chief Executive Michael Strianese.

Sales in the aerospace segment shrank 4.4% to $1 billion

Mr. Strianese said that to improve the sector's performance, the company recently integrated the business into its ISR Systems sector. "Additionally, we anticipate opportunities elsewhere in Aerospace Systems later this year that will improve the segment's results," he said.

Electronic systems sales fell 6.3%, communications systems revenue dropped 13.5%, and national security solutions sales plunged 20%.

In all, L-3 booked a profit of $105 million, or $1.25 a share, down from $170 million, or $1.90 a share, a year earlier. Excluding certain items, such as a loss related to an expected divestiture, per-share profit fell to $1.43 from $1.90. Revenue decreased 8.3% to $2.7 billion.

Analysts expected $1.54 in earnings a share and $2.8 billion in revenue.

Shares in the company, down about 3% this year, were inactive during premarket trading.

Write to Lisa Beilfuss at lisa.beilfuss@wsj.com

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