Security Classification 
KEY WORDS 
Marine Biological Noise 
Underwater Noise 
INSTRUCTIONS 
1, ORIGINATING ACTIVITY: Enter the name and address 
of the contractor, subcontractor, grantee, Department of De 
fense activity or other organization (corporate author) issuing 
the report. 
2a. REPORT SECURITY CLASSIFICATION: Enter the over- 
all security classification of the report. Indicate whether 
“Restricted Data’’ is included. Marking is to be in accord- 
ance with appropriate security regulations. 
2b. GROUP: Automatic downgrading is specified in DoD Di- 
rective 5200.10 and Armed Forces Industrial Manual. Enter 
the group number. Also, when applicable, show that optional 
markings have been used for Group 3 and Group 4 as author- 
ized. 
3. REPORT TITLE: Enter the complete report title in all 
capital letters. Titles in all cases should be unclassified. 
If a meaningful title cannot be selected without classifica- 
tion, show title classification in all capitals in parenthesis 
immediately following the title. 
4. DESCRIPTIVE NOTES: If appropriate, enter the type of 
report, e.g., interim, progress, Summary, annual, or final. 
Give the inclusive dates when a specific reporting period is 
covered. 
5. AUTHOR(S): 
or in the report. 
If military, show rank and branch of service. The name of 
the principal author is an ahsolute minimum requirement. 
6. REPORT DATE: Enter the date of the report as day, 
month, year, or month, year If more than one date appears 
on the report, use date of publication. 
7a. TOTAL NUMBER OF PAGES: The total page count 
should follow normal pagination procedures, i.e., enter the 
number of pages containing information. 
7b. NUMBER OF REFERENCES: Enter the total number of 
references cited in the report. 
8a. CONTRACT OR GRANT NUMBER: If appropriate, enter 
the applicable number of the contract or grant under which 
the report was written 
8b, 8, & 8d. PROJECT NUMBER: Enter the appropriate 
military department identification, such as project number, 
subproject number, system numbers, task number, etc. 
9a. ORIGINATOR’S REPORT NUMBER(S): Enter the offi- 
cial report number by which the document will be identified 
and controlled by the originating activity. This number must 
be unique to this report. 
9b. OTHER REPORT NUMBER(S): If the report has been 
assigned any other report numbers (either by the originator 
or by the sponsor), also enter this number(s). 
10. AVAILABILITY/LIMITATION NOTICES: Enter any lim- 
itations on further dissemination of the report, other than those 
Enter the name(s) of author(s) as shown on 
Enter last name, first name, middle initial. 
imposed by security classification, using standard statements 
such as: 
Q) 
“*Qualified requesters may obtain copies of this 
report from DDC.’’ 
“Foreign announcement and dissemination of this 
report by DDC is not authorized.’’ 
(2) 
(3) ‘‘U. S. Government agencies may obtain copies of 
this report directly from DDC. Other qualified DDC 
users shall request through 
“U.S. military agencies may obtain copies of this 
report directly from DDC. Other qualified users 
shall request through 
(5) ‘All distribution of this report is controlled. Qual- 
ified DDC users shall request through 
” 
If the report has been furnished to the Office of Technical 
Services, Department of Commerce, for sale to the public, indi- 
cate this fact and enter the price, if known 
11. SUPPLEMENTARY NOTES: Use for additional explana- 
tory notes. 
12. SPONSORING MILITARY ACTIVITY: Enter the name of 
the departmental project office or laboratory sponsoring (pay 
ing for) the research and development. Include address. 
13. ABSTRACT: Enter an abstract giving a brief and factual 
summary of the document indicative of the report, even though 
it may also appear elsewhere in the body of the technical re- 
port. If additional space is required, a continuation sheet shall 
be attached. 
It is highly desirable that the abstract of classified reports 
be unclassified. Each paragraph of the abstract shall end with 
an indication of the military security classification of the in- 
formation in the paragraph, represented as (TS), (S), (C), or (U) 
There is no limitation on the length of the abstract. How- 
ever, the suggested length is from 150 to 225 words. 
14. KEY WORDS: Key words are technically meaningful terms 
or short phrases that characterize a report and may be used as 
index entries for cataloging the report. Key words must be 
selected so that no security classification is required. Identi- 
fiers, such as equipment mode! designation, trade name, military 
project code name, geographic location, may be used as key 
words but will be followed by an indication of technical con- 
text. The assignment of links, rales, and weights is optional. 
Security Classification 
